diff --git a/apps/control-station/src/components/RecordedFmp4Player.tsx b/apps/control-station/src/components/RecordedFmp4Player.tsx
index 9e11dc2..33f4d33 100644
--- a/apps/control-station/src/components/RecordedFmp4Player.tsx
+++ b/apps/control-station/src/components/RecordedFmp4Player.tsx
@@ -352,6 +352,7 @@ interface RecordedSegmentStreamRuntime {
   target: RecordedSegmentTarget | null;
   fetchAbort: AbortController | null;
   notifiedRevision: number;
+  hasPresentedFrame: boolean;
   pumping: boolean;
   disposed: boolean;
   onTargetBuffered: ((target: RecordedSegmentTarget) => void) | null;
@@ -944,6 +945,7 @@ export function RecordedFmp4Player({
         target: null,
         fetchAbort: null,
         notifiedRevision: 0,
+        hasPresentedFrame: false,
         pumping: false,
         disposed: false,
         onTargetBuffered: null,
@@ -1090,8 +1092,13 @@ export function RecordedFmp4Player({
     runtime.fetchAbort?.abort();
     runtime.target = target;
     const alreadyBuffered = recordedSegmentTargetBuffered(runtime, target);
+    const retainForwardFrame = Boolean(
+      runtime.hasPresentedFrame
+      && previousTarget
+      && candidateTarget.sequence >= previousTarget.sequence,
+    );
     video.pause();
-    if (!alreadyBuffered) {
+    if (!alreadyBuffered && !retainForwardFrame) {
       setReadyGeneration(null);
       setState("loading");
     }
@@ -1119,6 +1126,7 @@ export function RecordedFmp4Player({
             || runtime.target?.revision !== bufferedTarget.revision
           ) return;
           setBufferRevision((revision) => revision + 1);
+          runtime.hasPresentedFrame = true;
           setReadyGeneration(runtime.generation);
           setState("ready");
           reportAdmission({
diff --git a/apps/control-station/src/components/laboratory/LaboratoryMetricEvidenceScene.tsx b/apps/control-station/src/components/laboratory/LaboratoryMetricEvidenceScene.tsx
index f14897c..a4bb6bd 100644
--- a/apps/control-station/src/components/laboratory/LaboratoryMetricEvidenceScene.tsx
+++ b/apps/control-station/src/components/laboratory/LaboratoryMetricEvidenceScene.tsx
@@ -1,6 +1,7 @@
 import {
   forwardRef,
   type CSSProperties,
+  useCallback,
   useEffect,
   useImperativeHandle,
   useRef,
@@ -53,6 +54,12 @@ export interface LaboratoryMetricCellEvidence {
   state: LaboratoryMetricCellState;
 }
 
+export interface LaboratoryMetricPackedCellEvidence {
+  centersBodyXyM: Float32Array;
+  zBoundsM: Float32Array;
+  stateCodes: Uint8Array;
+}
+
 export interface LaboratoryMetricLegendEntry {
   id: LaboratoryMetricDecision
     | LaboratoryMetricCellState
@@ -63,6 +70,13 @@ export interface LaboratoryMetricLegendEntry {
   label: string;
 }
 
+interface LaboratoryMetricRenderStats {
+  frameMs: number;
+  drawCalls: number;
+  triangles: number;
+  pixelRatio: number;
+}
+
 export function laboratoryMetricLegendEntries({
   pointCloudCount,
   localSurfaceCount,
@@ -256,6 +270,7 @@ LaboratoryMetricEvidenceSceneHandle,
   semanticClasses?: readonly RecordedEvidenceSemanticClass[];
   semanticPalette?: readonly RecordedEvidenceSemanticPaletteEntry[];
   classifiedCells?: readonly LaboratoryMetricCellEvidence[];
+  classifiedPackedCells?: LaboratoryMetricPackedCellEvidence;
   classifiedCellSizeM?: number;
   showClassifiedCells?: boolean;
 }
@@ -276,6 +291,7 @@ LaboratoryMetricEvidenceSceneHandle,
   semanticClasses,
   semanticPalette,
   classifiedCells = [],
+  classifiedPackedCells,
   classifiedCellSizeM = 0.45,
   showClassifiedCells = true,
 }, ref) {
@@ -288,10 +304,16 @@ LaboratoryMetricEvidenceSceneHandle,
   const classifiedContentRef = useRef<THREE.Group | null>(null);
   const localSurfacePointsRef = useRef<THREE.Points | null>(null);
   const currentIncrementPointsRef = useRef<THREE.Points | null>(null);
+  const requestRenderRef = useRef<() => void>(() => undefined);
+  const corridorForwardLengthRef = useRef(corridor.forwardLengthM);
+  const modeRef = useRef(mode);
   const classifiedMeshesRef = useRef<ReadonlyMap<LaboratoryMetricCellState, THREE.InstancedMesh>>(
     new Map(),
   );
   const [renderError, setRenderError] = useState<string | null>(null);
+  const [renderStats, setRenderStats] = useState<LaboratoryMetricRenderStats | null>(null);
+  corridorForwardLengthRef.current = corridor.forwardLengthM;
+  modeRef.current = mode;
 
   useEffect(() => {
     const host = hostRef.current;
@@ -368,27 +390,51 @@ LaboratoryMetricEvidenceSceneHandle,
     localSurfacePointsRef.current = localSurfacePoints;
     currentIncrementPointsRef.current = currentIncrementPoints;
 
+    let animationFrame: number | null = null;
+    let lastStatsAt = Number.NEGATIVE_INFINITY;
+    const render = () => {
+      animationFrame = null;
+      // OrbitControls emits another change while damping is still settling, so
+      // this remains smooth during interaction without rendering forever while
+      // the evidence scene is idle.
+      controls.update();
+      const startedAt = performance.now();
+      renderer.render(scene, camera);
+      const completedAt = performance.now();
+      if (completedAt - lastStatsAt >= 1_000) {
+        lastStatsAt = completedAt;
+        setRenderStats({
+          frameMs: completedAt - startedAt,
+          drawCalls: renderer.info.render.calls,
+          triangles: renderer.info.render.triangles,
+          pixelRatio: renderer.getPixelRatio(),
+        });
+      }
+    };
+    const requestRender = () => {
+      if (animationFrame !== null) return;
+      animationFrame = window.requestAnimationFrame(render);
+    };
+    requestRenderRef.current = requestRender;
+    controls.addEventListener("change", requestRender);
+
     const resize = () => {
       const width = Math.max(host.clientWidth, 1);
       const height = Math.max(host.clientHeight, 1);
       camera.aspect = width / height;
       camera.updateProjectionMatrix();
       renderer.setSize(width, height, false);
+      requestRender();
     };
     const observer = new ResizeObserver(resize);
     observer.observe(host);
     resize();
 
-    let animationFrame = 0;
-    const render = () => {
-      animationFrame = window.requestAnimationFrame(render);
-      controls.update();
-      renderer.render(scene, camera);
-    };
-    render();
+    requestRender();
     return () => {
-      window.cancelAnimationFrame(animationFrame);
+      if (animationFrame !== null) window.cancelAnimationFrame(animationFrame);
       observer.disconnect();
+      controls.removeEventListener("change", requestRender);
       controls.dispose();
       scene.traverse(disposeRenderable);
       renderer.dispose();
@@ -401,6 +447,7 @@ LaboratoryMetricEvidenceSceneHandle,
       classifiedContentRef.current = null;
       localSurfacePointsRef.current = null;
       currentIncrementPointsRef.current = null;
+      requestRenderRef.current = () => undefined;
       classifiedMeshesRef.current = new Map();
     };
   }, []);
@@ -415,6 +462,7 @@ LaboratoryMetricEvidenceSceneHandle,
     if (!points) return;
     points.visible = showLocalSurface && localSurfaceBodyXyzM.length > 0;
     if (points.visible) updatePointPositions(points.geometry, localSurfaceBodyXyzM);
+    requestRenderRef.current();
   }, [localSurfaceBodyXyzM, showLocalSurface]);
 
   useEffect(() => {
@@ -422,7 +470,10 @@ LaboratoryMetricEvidenceSceneHandle,
     const points = currentIncrementPointsRef.current;
     if (!host || !points) return;
     points.visible = showCurrentIncrement && pointCloudBodyXyzM.length > 0;
-    if (!points.visible) return;
+    if (!points.visible) {
+      requestRenderRef.current();
+      return;
+    }
     updatePointPositions(points.geometry, pointCloudBodyXyzM);
     const material = points.material as THREE.PointsMaterial;
     const hasAlignedSemanticClasses =
@@ -436,6 +487,7 @@ LaboratoryMetricEvidenceSceneHandle,
         material.needsUpdate = true;
       }
       material.color.copy(tokenColor(host, "--nodedc-text-muted", [147, 151, 159]));
+      requestRenderRef.current();
       return;
     }
     const declaredIds = new Set(semanticClasses.map((item) => item.id));
@@ -461,6 +513,7 @@ LaboratoryMetricEvidenceSceneHandle,
       material.needsUpdate = true;
     }
     material.color.setRGB(1, 1, 1);
+    requestRenderRef.current();
   }, [
     pointCloudBodyXyzM,
     pointSemanticClassIds,
@@ -543,7 +596,7 @@ LaboratoryMetricEvidenceSceneHandle,
         content.add(centroid);
       }
     }
-
+    requestRenderRef.current();
   }, [
     obstacles,
     occupiedVoxelSizeM,
@@ -556,10 +609,21 @@ LaboratoryMetricEvidenceSceneHandle,
     const host = hostRef.current;
     const content = classifiedContentRef.current;
     if (!host || !content) return;
-    content.visible = showClassifiedCells && classifiedCells.length > 0;
-    if (!content.visible) return;
+    const packedCellCount = classifiedPackedCells?.stateCodes.length ?? 0;
+    const packedCellsValid = !classifiedPackedCells || (
+      classifiedPackedCells.centersBodyXyM.length === packedCellCount * 2
+      && classifiedPackedCells.zBoundsM.length === packedCellCount * 2
+    );
+    const cellCount = packedCellsValid && classifiedPackedCells
+      ? packedCellCount
+      : classifiedCells.length;
+    content.visible = showClassifiedCells && cellCount > 0;
+    if (!content.visible) {
+      requestRenderRef.current();
+      return;
+    }
 
-    const requiredCapacity = classifiedCells.length;
+    const requiredCapacity = cellCount;
     const currentMeshes = classifiedMeshesRef.current;
     const firstMesh = currentMeshes.values().next().value as THREE.InstancedMesh | undefined;
     const needsAllocation = !firstMesh
@@ -609,12 +673,16 @@ LaboratoryMetricEvidenceSceneHandle,
     const position = new THREE.Vector3();
     const scale = new THREE.Vector3(1, 1, 1);
     const rotation = new THREE.Quaternion();
-    for (const cell of classifiedCells) {
-      const mesh = meshes.get(cell.state);
-      if (!mesh) continue;
-      const index = counts.get(cell.state) ?? 0;
-      const minimum = cell.zBoundsM[0];
-      const maximum = cell.zBoundsM[1];
+    const setCell = (
+      state: LaboratoryMetricCellState,
+      centerX: number,
+      centerY: number,
+      minimum: number | null,
+      maximum: number | null,
+    ) => {
+      const mesh = meshes.get(state);
+      if (!mesh) return;
+      const index = counts.get(state) ?? 0;
       const height = minimum === null || maximum === null
         ? 0.018
         : Math.max(0.018, maximum - minimum);
@@ -622,21 +690,55 @@ LaboratoryMetricEvidenceSceneHandle,
         ? -0.012
         : (minimum + maximum) / 2;
       const [sceneX, sceneY, sceneZ] = scenePoint([
-        cell.centerBodyXyM[0],
-        cell.centerBodyXyM[1],
+        centerX,
+        centerY,
         centerZ,
       ]);
       position.set(sceneX, sceneY, sceneZ);
       scale.set(1, height, 1);
       matrix.compose(position, rotation, scale);
       mesh.setMatrixAt(index, matrix);
-      counts.set(cell.state, index + 1);
+      counts.set(state, index + 1);
+    };
+    if (packedCellsValid && classifiedPackedCells) {
+      for (let cellIndex = 0; cellIndex < packedCellCount; cellIndex += 1) {
+        const code = classifiedPackedCells.stateCodes[cellIndex];
+        const state: LaboratoryMetricCellState = code === 1
+          ? "ground-support"
+          : code === 2
+            ? "nonground-occupied"
+            : code === 3
+              ? "unknown-rejected"
+              : code === 0
+                ? "unobserved"
+                : "unknown-rejected";
+        const minimum = classifiedPackedCells.zBoundsM[cellIndex * 2]!;
+        const maximum = classifiedPackedCells.zBoundsM[cellIndex * 2 + 1]!;
+        setCell(
+          state,
+          classifiedPackedCells.centersBodyXyM[cellIndex * 2]!,
+          classifiedPackedCells.centersBodyXyM[cellIndex * 2 + 1]!,
+          Number.isFinite(minimum) ? minimum : null,
+          Number.isFinite(maximum) ? maximum : null,
+        );
+      }
+    } else {
+      for (const cell of classifiedCells) {
+        setCell(
+          cell.state,
+          cell.centerBodyXyM[0],
+          cell.centerBodyXyM[1],
+          cell.zBoundsM[0],
+          cell.zBoundsM[1],
+        );
+      }
     }
     for (const [state, mesh] of meshes) {
       mesh.count = counts.get(state) ?? 0;
       mesh.instanceMatrix.needsUpdate = true;
     }
-  }, [classifiedCellSizeM, classifiedCells, showClassifiedCells]);
+    requestRenderRef.current();
+  }, [classifiedCellSizeM, classifiedCells, classifiedPackedCells, showClassifiedCells]);
 
   useEffect(() => {
     const host = hostRef.current;
@@ -702,15 +804,24 @@ LaboratoryMetricEvidenceSceneHandle,
       material.depthWrite = false;
     });
     content.add(grid);
-  }, [corridor, rig]);
+    requestRenderRef.current();
+  }, [
+    corridor.forwardLengthM,
+    corridor.halfWidthM,
+    corridor.rearMarginM,
+    rig.lengthM,
+    rig.nominalSensorHeightM,
+    rig.widthM,
+  ]);
 
-  const resetView = () => {
+  const resetView = useCallback(() => {
     const camera = cameraRef.current;
     const controls = controlsRef.current;
     if (!camera || !controls) return;
-    controls.target.set(corridor.forwardLengthM * 0.35, 0.6, 0);
-    if (mode === "plan") {
-      camera.position.set(corridor.forwardLengthM * 0.35, 15, 0.001);
+    const forwardLengthM = corridorForwardLengthRef.current;
+    controls.target.set(forwardLengthM * 0.35, 0.6, 0);
+    if (modeRef.current === "plan") {
+      camera.position.set(forwardLengthM * 0.35, 15, 0.001);
       camera.up.set(0, 0, -1);
     } else {
       camera.position.set(-4.5, 4.8, 8.5);
@@ -718,10 +829,13 @@ LaboratoryMetricEvidenceSceneHandle,
     }
     camera.updateProjectionMatrix();
     controls.update();
-  };
+    requestRenderRef.current();
+  }, []);
 
-  useEffect(resetView, [corridor.forwardLengthM, mode]);
-  useImperativeHandle(ref, () => ({ resetView }));
+  // Playback data and rig object identities must never reset an operator's
+  // orbit. Only a deliberate 3D/PLAN mode transition chooses a default view.
+  useEffect(() => resetView(), [mode, resetView]);
+  useImperativeHandle(ref, () => ({ resetView }), [resetView]);
 
   const semanticLegendEntries = (() => {
     if (
@@ -755,8 +869,23 @@ LaboratoryMetricEvidenceSceneHandle,
     showLowStep,
   });
   const classifiedLegendEntries = (() => {
-    if (!showClassifiedCells || !classifiedCells.length) return [];
-    const states = new Set(classifiedCells.map((cell) => cell.state));
+    const states = new Set<LaboratoryMetricCellState>();
+    if (classifiedPackedCells) {
+      for (const code of classifiedPackedCells.stateCodes) {
+        states.add(code === 1
+          ? "ground-support"
+          : code === 2
+            ? "nonground-occupied"
+            : code === 3
+              ? "unknown-rejected"
+              : code === 0
+                ? "unobserved"
+                : "unknown-rejected");
+      }
+    } else {
+      classifiedCells.forEach((cell) => states.add(cell.state));
+    }
+    if (!showClassifiedCells || !states.size) return [];
     return [
       states.has("ground-support")
         ? { id: "ground-support" as const, label: "Ground support" }
@@ -783,6 +912,16 @@ LaboratoryMetricEvidenceSceneHandle,
         {renderError ? <p>{renderError}</p> : null}
       </div>
       <div className="laboratory-metric-evidence-scene__legend">
+        {renderStats ? (
+          <span
+            data-decision="performance"
+            title="CPU-время отправки последнего WebGL render pass; это не GPU timer. В покое сцена не перерисовывается."
+          >
+            3D {renderStats.frameMs.toFixed(1)} ms · {renderStats.drawCalls} draw · {renderStats.triangles.toLocaleString("ru-RU")} tri · {(
+              classifiedPackedCells?.stateCodes.length ?? classifiedCells.length
+            ).toLocaleString("ru-RU")} cells · {renderStats.pixelRatio.toFixed(1)}×
+          </span>
+        ) : null}
         {metricLegendEntries.map((entry) => (
           <span key={entry.id} data-decision={entry.id}>{entry.label}</span>
         ))}
diff --git a/apps/control-station/src/core/laboratory/m49PhysicalSafetyPlayback.ts b/apps/control-station/src/core/laboratory/m49PhysicalSafetyPlayback.ts
new file mode 100644
index 0000000..2f88c0f
--- /dev/null
+++ b/apps/control-station/src/core/laboratory/m49PhysicalSafetyPlayback.ts
@@ -0,0 +1,671 @@
+import type { LaboratoryFetch } from "./advancedResults";
+
+const RESULT_ID = /^m49-physical-safety-playback-[a-f0-9]{64}$/;
+const SOURCE_RESULT_ID = /^m49-tgs-full-shadow-[a-f0-9]{64}$/;
+const SCHEMA = "missioncore.m49-physical-safety-playback/v1";
+const CHUNK_MAGIC = "MCPSCH01";
+const CHUNK_HEADER_BYTES = 28;
+const ENDPOINT_ROOT = "/api/v1/laboratory/m49/physical-safety-playback";
+
+export interface M49PhysicalSafetyPlaybackFrameMetadata {
+  sourceSequence: number;
+  sourceFrameIndex: number;
+  sessionSeconds: number;
+  sampleAvailable: boolean;
+  metrics: Readonly<Record<string, number>>;
+}
+
+interface ArtifactDescriptor {
+  url: string;
+  mediaType: string;
+  byteLength: number;
+  sha256: string;
+}
+
+interface ChunkDescriptor extends ArtifactDescriptor {
+  index: number;
+  start: number;
+  count: number;
+  headerBytes: 28;
+  format: "mcpsch01-states-u8-aligned-z-bounds-f32le";
+}
+
+export interface M49PhysicalSafetyPlaybackManifest {
+  resultId: string;
+  createdAtUtc: string;
+  sourceResultId: string;
+  frameCount: number;
+  cellCount: number;
+  cellSizeM: number;
+  radiusM: number;
+  sourcePaceHz: number;
+  stateCodes: Readonly<Record<string, number>>;
+  chunkFrameCount: 32;
+  startupPrebufferChunkCount: 2;
+  residentChunkCountMax: 3;
+  forwardPrefetchChunkCount: 1;
+  centers: ArtifactDescriptor;
+  frames: ArtifactDescriptor;
+  chunks: readonly ChunkDescriptor[];
+}
+
+interface ResidentChunk {
+  descriptor: ChunkDescriptor;
+  states: Uint8Array;
+  zBoundsM: Float32Array;
+  byteLength: number;
+}
+
+export interface M49PhysicalSafetyPlaybackFrame {
+  metadata: M49PhysicalSafetyPlaybackFrameMetadata;
+  centersXyM: Float32Array;
+  states: Uint8Array;
+  zBoundsM: Float32Array;
+  cellSizeM: number;
+  radiusM: number;
+}
+
+export interface M49PhysicalSafetyPlaybackProgress {
+  phase: "manifest" | "static" | "prebuffer" | "ready" | "seek";
+  residentChunkIndexes: readonly number[];
+  loadedBytes: number;
+}
+
+export class M49PhysicalSafetyPlaybackContractError extends Error {}
+
+function objectValue(value: unknown, label: string): Record<string, unknown> {
+  if (!value || typeof value !== "object" || Array.isArray(value)) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: ожидался объект.`);
+  }
+  return value as Record<string, unknown>;
+}
+
+function text(value: unknown, label: string): string {
+  if (typeof value !== "string" || !value.trim()) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: ожидалась строка.`);
+  }
+  return value;
+}
+
+function finiteNumber(value: unknown, label: string): number {
+  if (typeof value !== "number" || !Number.isFinite(value)) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: ожидалось число.`);
+  }
+  return value;
+}
+
+function integer(value: unknown, label: string): number {
+  const parsed = finiteNumber(value, label);
+  if (!Number.isSafeInteger(parsed) || parsed < 0) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: ожидалось целое число.`);
+  }
+  return parsed;
+}
+
+function booleanValue(value: unknown, label: string): boolean {
+  if (typeof value !== "boolean") {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: ожидался boolean.`);
+  }
+  return value;
+}
+
+function exact<T extends string | number | boolean>(value: unknown, expected: T, label: string): T {
+  if (value !== expected) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: нарушен контракт.`);
+  }
+  return expected;
+}
+
+function sha256(value: unknown, label: string): string {
+  const parsed = text(value, label);
+  if (!/^[a-f0-9]{64}$/.test(parsed)) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: SHA-256 недопустим.`);
+  }
+  return parsed;
+}
+
+function localUrl(value: unknown, expected: string, label: string): string {
+  const parsed = text(value, label);
+  if (parsed !== expected || parsed.includes("worker")) {
+    throw new M49PhysicalSafetyPlaybackContractError(`${label}: разрешён только sealed local API.`);
+  }
+  return parsed;
+}
+
+function descriptor(
+  value: unknown,
+  expectedUrl: string,
+  label: string,
+): ArtifactDescriptor {
+  const row = objectValue(value, label);
+  return {
+    url: localUrl(row.url, expectedUrl, `${label}.url`),
+    mediaType: text(row.media_type, `${label}.media_type`),
+    byteLength: integer(row.byte_length, `${label}.byte_length`),
+    sha256: sha256(row.sha256, `${label}.sha256`),
+  };
+}
+
+async function sha256Hex(buffer: ArrayBuffer): Promise<string> {
+  if (!globalThis.crypto?.subtle) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      "Браузер не поддерживает проверку playback SHA-256.",
+    );
+  }
+  const digest = await globalThis.crypto.subtle.digest("SHA-256", buffer);
+  return [...new Uint8Array(digest)]
+    .map((value) => value.toString(16).padStart(2, "0"))
+    .join("");
+}
+
+async function fetchVerified(
+  artifact: ArtifactDescriptor,
+  fetcher: LaboratoryFetch,
+  signal?: AbortSignal,
+): Promise<ArrayBuffer> {
+  const response = await fetcher(artifact.url, {
+    method: "GET",
+    headers: { Accept: artifact.mediaType },
+    signal,
+  });
+  if (!response.ok) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      `Sealed local playback недоступен: HTTP ${response.status}.`,
+    );
+  }
+  const buffer = await response.arrayBuffer();
+  if (buffer.byteLength !== artifact.byteLength) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      "Sealed local playback: получен неверный размер.",
+    );
+  }
+  if (await sha256Hex(buffer) !== artifact.sha256) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      "Sealed local playback: SHA-256 не совпал.",
+    );
+  }
+  return buffer;
+}
+
+function parseStateCodes(value: unknown): Readonly<Record<string, number>> {
+  const row = objectValue(value, "M49 physical-safety state codes");
+  const parsed: Record<string, number> = {};
+  for (const [name, code] of Object.entries(row)) {
+    const stateCode = integer(code, `M49 physical-safety state code ${name}`);
+    if (stateCode > 255) {
+      throw new M49PhysicalSafetyPlaybackContractError("M49 state code превышает uint8.");
+    }
+    parsed[name] = stateCode;
+  }
+  if (parsed.UNOBSERVED !== 0 || !Object.keys(parsed).length) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 UNOBSERVED state изменился.");
+  }
+  return parsed;
+}
+
+async function fetchManifest(
+  resultId: string,
+  fetcher: LaboratoryFetch,
+  signal?: AbortSignal,
+): Promise<M49PhysicalSafetyPlaybackManifest> {
+  if (!RESULT_ID.test(resultId)) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 physical-safety identity недопустима.");
+  }
+  const base = `${ENDPOINT_ROOT}/${encodeURIComponent(resultId)}`;
+  const response = await fetcher(`${base}/manifest`, {
+    method: "GET",
+    headers: { Accept: "application/json" },
+    signal,
+  });
+  if (!response.ok) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      `M49 physical-safety manifest недоступен: HTTP ${response.status}.`,
+    );
+  }
+  const payload = objectValue(await response.json(), "M49 physical-safety manifest");
+  exact(payload.schema_version, SCHEMA, "M49 physical-safety schema");
+  exact(payload.result_id, resultId, "M49 physical-safety result");
+  exact(payload.access, "read-only-sealed-local", "M49 physical-safety access");
+  const identity = objectValue(payload.identity, "M49 physical-safety identity");
+  const execution = objectValue(payload.execution, "M49 physical-safety execution");
+  exact(execution.execution_class, "local-sequential-offline", "M49 execution class");
+  exact(execution.worker_role, "realtime-only", "M49 worker role");
+  exact(execution.worker_runtime_dependency, false, "M49 worker dependency");
+  exact(execution.worker_requests_required, 0, "M49 worker requests");
+  const authority = objectValue(payload.authority, "M49 physical-safety authority");
+  exact(authority.commands_enabled, false, "M49 commands");
+  exact(authority.navigation_or_safety_accepted, false, "M49 safety authority");
+  exact(authority.actuation_accepted, false, "M49 actuation authority");
+  const playback = objectValue(payload.playback, "M49 physical-safety playback");
+  exact(playback.coordinate_frame, "map-gravity-local", "M49 coordinate frame");
+  const frameCount = integer(playback.frame_count, "M49 frame count");
+  const cellCount = integer(playback.cell_count, "M49 cell count");
+  if (!frameCount || !cellCount) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 playback не содержит evidence.");
+  }
+  const chunkFrameCount = exact(
+    integer(playback.chunk_frame_count, "M49 chunk frame count"),
+    32,
+    "M49 chunk frame count",
+  );
+  const startupPrebufferChunkCount = exact(
+    integer(playback.startup_prebuffer_chunk_count, "M49 startup prebuffer"),
+    2,
+    "M49 startup prebuffer",
+  );
+  const residentChunkCountMax = exact(
+    integer(playback.resident_chunk_count_max, "M49 resident chunks"),
+    3,
+    "M49 resident chunks",
+  );
+  const forwardPrefetchChunkCount = exact(
+    integer(playback.forward_prefetch_chunk_count, "M49 forward prefetch"),
+    1,
+    "M49 forward prefetch",
+  );
+  const centers = descriptor(playback.centers, `${base}/tracks/centers`, "M49 centers");
+  const centerRow = objectValue(playback.centers, "M49 centers");
+  exact(centerRow.dtype, "<f4", "M49 centers dtype");
+  if (!Array.isArray(centerRow.shape)
+      || centerRow.shape.length !== 2
+      || centerRow.shape[0] !== cellCount
+      || centerRow.shape[1] !== 2
+      || centers.byteLength !== cellCount * 2 * 4) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 centers shape изменилась.");
+  }
+  const frames = descriptor(playback.frames, `${base}/tracks/frames`, "M49 frames");
+  const frameRow = objectValue(playback.frames, "M49 frames");
+  exact(frameRow.dtype, "ndjson", "M49 frames dtype");
+  if (!Array.isArray(frameRow.shape)
+      || frameRow.shape.length !== 1
+      || frameRow.shape[0] !== frameCount) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 frames shape изменилась.");
+  }
+  if (!Array.isArray(playback.chunks)) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 chunk catalog отсутствует.");
+  }
+  const expectedChunkCount = Math.ceil(frameCount / chunkFrameCount);
+  if (playback.chunks.length !== expectedChunkCount) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 chunk accounting нарушен.");
+  }
+  const chunks = playback.chunks.map((value, index): ChunkDescriptor => {
+    const row = objectValue(value, `M49 chunk ${index}`);
+    const common = descriptor(value, `${base}/chunks/${index}`, `M49 chunk ${index}`);
+    const start = index * chunkFrameCount;
+    const count = Math.min(chunkFrameCount, frameCount - start);
+    exact(integer(row.index, `M49 chunk ${index}.index`), index, `M49 chunk ${index}.index`);
+    exact(integer(row.start, `M49 chunk ${index}.start`), start, `M49 chunk ${index}.start`);
+    exact(integer(row.count, `M49 chunk ${index}.count`), count, `M49 chunk ${index}.count`);
+    return {
+      ...common,
+      index,
+      start,
+      count,
+      headerBytes: exact(
+        integer(row.header_bytes, `M49 chunk ${index}.header`),
+        CHUNK_HEADER_BYTES,
+        `M49 chunk ${index}.header`,
+      ),
+      format: exact(
+        row.format,
+        "mcpsch01-states-u8-aligned-z-bounds-f32le",
+        `M49 chunk ${index}.format`,
+      ),
+    };
+  });
+  return {
+    resultId,
+    createdAtUtc: text(payload.created_at_utc, "M49 physical-safety created"),
+    sourceResultId: text(identity.source_result_id, "M49 physical-safety source"),
+    frameCount,
+    cellCount,
+    cellSizeM: finiteNumber(playback.cell_size_m, "M49 cell size"),
+    radiusM: finiteNumber(playback.radius_m, "M49 radius"),
+    sourcePaceHz: finiteNumber(playback.source_pace_hz, "M49 source pace"),
+    stateCodes: parseStateCodes(playback.state_codes),
+    chunkFrameCount,
+    startupPrebufferChunkCount,
+    residentChunkCountMax,
+    forwardPrefetchChunkCount,
+    centers,
+    frames,
+    chunks,
+  };
+}
+
+export async function fetchM49PhysicalSafetyPlaybackIdForSource(
+  sourceResultId: string,
+  {
+    fetcher = fetch,
+    signal,
+  }: { fetcher?: LaboratoryFetch; signal?: AbortSignal } = {},
+): Promise<string | null> {
+  if (!SOURCE_RESULT_ID.test(sourceResultId)) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 source identity недопустима.");
+  }
+  const response = await fetcher(
+    `${ENDPOINT_ROOT}/results?limit=2&source_result_id=${encodeURIComponent(sourceResultId)}`,
+    { method: "GET", headers: { Accept: "application/json" }, signal },
+  );
+  if (!response.ok) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      `M49 physical-safety catalog недоступен: HTTP ${response.status}.`,
+    );
+  }
+  const payload = objectValue(await response.json(), "M49 physical-safety catalog");
+  exact(
+    payload.schema_version,
+    "missioncore.m49-physical-safety-playback-catalog/v1",
+    "M49 physical-safety catalog schema",
+  );
+  exact(payload.worker_runtime_dependency, false, "M49 physical-safety catalog worker");
+  exact(payload.access, "read-only-sealed-local", "M49 physical-safety catalog access");
+  if (!Array.isArray(payload.items)) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 physical-safety catalog изменился.");
+  }
+  if (!payload.items.length) return null;
+  if (payload.items.length !== 1) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      "M49 physical-safety source имеет несколько активных playback artifacts.",
+    );
+  }
+  const item = objectValue(payload.items[0], "M49 physical-safety catalog item");
+  exact(item.source_result_id, sourceResultId, "M49 physical-safety catalog source");
+  exact(item.worker_runtime_dependency, false, "M49 physical-safety item worker");
+  exact(item.navigation_or_safety_accepted, false, "M49 physical-safety item authority");
+  const resultId = text(item.result_id, "M49 physical-safety catalog result");
+  if (!RESULT_ID.test(resultId)) {
+    throw new M49PhysicalSafetyPlaybackContractError(
+      "M49 physical-safety catalog result недопустим.",
+    );
+  }
+  return resultId;
+}
+
+function parseFrames(
+  buffer: ArrayBuffer,
+  frameCount: number,
+): readonly M49PhysicalSafetyPlaybackFrameMetadata[] {
+  const lines = new TextDecoder().decode(buffer).trim().split("\n");
+  if (lines.length !== frameCount) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 frame catalog изменил размер.");
+  }
+  return lines.map((line, sourceSequence) => {
+    const row = objectValue(JSON.parse(line), `M49 frame ${sourceSequence}`);
+    const metrics: Record<string, number> = {};
+    for (const [name, value] of Object.entries(row)) {
+      if (name.endsWith("_count") && typeof value === "number" && Number.isFinite(value)) {
+        metrics[name] = value;
+      }
+    }
+    return {
+      sourceSequence,
+      sourceFrameIndex: integer(row.source_frame_index, `M49 frame ${sourceSequence}.source`),
+      sessionSeconds: finiteNumber(row.session_seconds, `M49 frame ${sourceSequence}.time`),
+      sampleAvailable: booleanValue(
+        row.sample_available,
+        `M49 frame ${sourceSequence}.available`,
+      ),
+      metrics,
+    };
+  });
+}
+
+function parseChunk(
+  buffer: ArrayBuffer,
+  descriptorValue: ChunkDescriptor,
+  cellCount: number,
+  frames: readonly M49PhysicalSafetyPlaybackFrameMetadata[],
+  admittedStateCodes: ReadonlySet<number>,
+): ResidentChunk {
+  const bytes = new Uint8Array(buffer);
+  if (bytes.byteLength < CHUNK_HEADER_BYTES
+      || new TextDecoder("latin1").decode(bytes.subarray(0, 8)) !== CHUNK_MAGIC) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 chunk signature изменилась.");
+  }
+  const view = new DataView(buffer);
+  const start = view.getUint32(8, true);
+  const count = view.getUint32(12, true);
+  const cells = view.getUint32(16, true);
+  const stateBytes = view.getUint32(20, true);
+  const zBytes = view.getUint32(24, true);
+  const expectedStateBytes = count * cellCount;
+  const expectedZBytes = count * cellCount * 2 * 4;
+  const zOffset = CHUNK_HEADER_BYTES + stateBytes
+    + ((4 - ((CHUNK_HEADER_BYTES + stateBytes) % 4)) % 4);
+  if (start !== descriptorValue.start
+      || count !== descriptorValue.count
+      || cells !== cellCount
+      || stateBytes !== expectedStateBytes
+      || zBytes !== expectedZBytes
+      || zOffset + zBytes !== bytes.byteLength) {
+    throw new M49PhysicalSafetyPlaybackContractError("M49 chunk layout изменился.");
+  }
+  const states = new Uint8Array(buffer, CHUNK_HEADER_BYTES, stateBytes);
+  const zBoundsM = new Float32Array(buffer, zOffset, count * cellCount * 2);
+  for (let localFrame = 0; localFrame < count; localFrame += 1) {
+    const stateStart = localFrame * cellCount;
+    const zStart = localFrame * cellCount * 2;
+    for (let cell = 0; cell < cellCount; cell += 1) {
+      const state = states[stateStart + cell];
+      if (!admittedStateCodes.has(state)) {
+        throw new M49PhysicalSafetyPlaybackContractError("M49 chunk содержит неизвестный state.");
+      }
+      if (!frames[start + localFrame].sampleAvailable
+          && (state !== 0
+            || Number.isFinite(zBoundsM[zStart + cell * 2])
+            || Number.isFinite(zBoundsM[zStart + cell * 2 + 1]))) {
+        throw new M49PhysicalSafetyPlaybackContractError(
+          "M49 missing sample перестал быть fail-closed.",
+        );
+      }
+    }
+  }
+  return { descriptor: descriptorValue, states, zBoundsM, byteLength: buffer.byteLength };
+}
+
+export class M49PhysicalSafetyPlaybackBuffer {
+  readonly manifest: M49PhysicalSafetyPlaybackManifest;
+  readonly centersXyM: Float32Array;
+  readonly frames: readonly M49PhysicalSafetyPlaybackFrameMetadata[];
+
+  private readonly fetcher: LaboratoryFetch;
+  private readonly signal: AbortSignal | undefined;
+  private readonly onProgress: ((value: M49PhysicalSafetyPlaybackProgress) => void) | undefined;
+  private readonly chunks = new Map<number, ResidentChunk>();
+  private readonly pending = new Map<number, Promise<ResidentChunk>>();
+  private readonly admittedStateCodes: ReadonlySet<number>;
+  private staticBytes: number;
+  private preparedWindowKey: string | null = null;
+  private pendingPrepare: { key: string; promise: Promise<void> } | null = null;
+
+  private constructor(
+    manifest: M49PhysicalSafetyPlaybackManifest,
+    centersXyM: Float32Array,
+    frames: readonly M49PhysicalSafetyPlaybackFrameMetadata[],
+    fetcher: LaboratoryFetch,
+    signal: AbortSignal | undefined,
+    onProgress: ((value: M49PhysicalSafetyPlaybackProgress) => void) | undefined,
+  ) {
+    this.manifest = manifest;
+    this.centersXyM = centersXyM;
+    this.frames = frames;
+    this.fetcher = fetcher;
+    this.signal = signal;
+    this.onProgress = onProgress;
+    this.admittedStateCodes = new Set(Object.values(manifest.stateCodes));
+    this.staticBytes = centersXyM.byteLength + manifest.frames.byteLength;
+  }
+
+  static async open(
+    resultId: string,
+    {
+      fetcher = fetch,
+      signal,
+      onProgress,
+    }: {
+      fetcher?: LaboratoryFetch;
+      signal?: AbortSignal;
+      onProgress?: (value: M49PhysicalSafetyPlaybackProgress) => void;
+    } = {},
+  ): Promise<M49PhysicalSafetyPlaybackBuffer> {
+    onProgress?.({ phase: "manifest", residentChunkIndexes: [], loadedBytes: 0 });
+    const manifest = await fetchManifest(resultId, fetcher, signal);
+    const [centersBuffer, framesBuffer] = await Promise.all([
+      fetchVerified(manifest.centers, fetcher, signal),
+      fetchVerified(manifest.frames, fetcher, signal),
+    ]);
+    onProgress?.({
+      phase: "static",
+      residentChunkIndexes: [],
+      loadedBytes: centersBuffer.byteLength + framesBuffer.byteLength,
+    });
+    const centersXyM = new Float32Array(centersBuffer);
+    const frames = parseFrames(framesBuffer, manifest.frameCount);
+    const playback = new M49PhysicalSafetyPlaybackBuffer(
+      manifest,
+      centersXyM,
+      frames,
+      fetcher,
+      signal,
+      onProgress,
+    );
+    const startupCount = Math.min(
+      manifest.startupPrebufferChunkCount,
+      manifest.chunks.length,
+    );
+    await Promise.all(Array.from(
+      { length: startupCount },
+      (_, index) => playback.loadChunk(index, "prebuffer"),
+    ));
+    playback.emit("ready");
+    return playback;
+  }
+
+  get residentChunkIndexes(): readonly number[] {
+    return [...this.chunks.keys()].sort((left, right) => left - right);
+  }
+
+  get residentByteLength(): number {
+    return this.staticBytes
+      + [...this.chunks.values()].reduce((sum, chunk) => sum + chunk.byteLength, 0);
+  }
+
+  async prepare(sourceSequence: number): Promise<void> {
+    const chunkIndex = this.chunkIndex(sourceSequence);
+    const nextIndex = chunkIndex + this.manifest.forwardPrefetchChunkCount;
+    const indexes = [chunkIndex, nextIndex].filter(
+      (index) => index < this.manifest.chunks.length,
+    );
+    const key = indexes.join(":");
+    if (this.preparedWindowKey === key && indexes.every((index) => this.chunks.has(index))) {
+      return;
+    }
+    if (this.pendingPrepare?.key === key) return this.pendingPrepare.promise;
+    const promise = Promise.all(indexes.map((index) => this.loadChunk(index, "seek")))
+      .then(() => {
+        this.trim(new Set(indexes));
+        this.preparedWindowKey = key;
+        this.emit("seek");
+      })
+      .finally(() => {
+        if (this.pendingPrepare?.key === key) this.pendingPrepare = null;
+      });
+    this.pendingPrepare = { key, promise };
+    return promise;
+  }
+
+  async frame(sourceSequence: number): Promise<M49PhysicalSafetyPlaybackFrame> {
+    const chunkIndex = this.chunkIndex(sourceSequence);
+    const chunk = await this.loadChunk(chunkIndex, "seek");
+    const frame = this.frameFromChunk(sourceSequence, chunk);
+    const nextIndex = chunkIndex + this.manifest.forwardPrefetchChunkCount;
+    if (nextIndex < this.manifest.chunks.length && !this.chunks.has(nextIndex)) {
+      void this.loadChunk(nextIndex, "seek").catch(() => undefined);
+    }
+    return frame;
+  }
+
+  frameIfResident(sourceSequence: number): M49PhysicalSafetyPlaybackFrame | null {
+    const chunkIndex = this.chunkIndex(sourceSequence);
+    const chunk = this.chunks.get(chunkIndex);
+    return chunk ? this.frameFromChunk(sourceSequence, chunk) : null;
+  }
+
+  private frameFromChunk(
+    sourceSequence: number,
+    chunk: ResidentChunk,
+  ): M49PhysicalSafetyPlaybackFrame {
+    const localFrame = sourceSequence - chunk.descriptor.start;
+    const stateOffset = localFrame * this.manifest.cellCount;
+    const zOffset = stateOffset * 2;
+    return {
+      metadata: this.frames[sourceSequence],
+      centersXyM: this.centersXyM,
+      states: chunk.states.subarray(stateOffset, stateOffset + this.manifest.cellCount),
+      zBoundsM: chunk.zBoundsM.subarray(zOffset, zOffset + this.manifest.cellCount * 2),
+      cellSizeM: this.manifest.cellSizeM,
+      radiusM: this.manifest.radiusM,
+    };
+  }
+
+  private chunkIndex(sourceSequence: number): number {
+    if (!Number.isSafeInteger(sourceSequence)
+        || sourceSequence < 0
+        || sourceSequence >= this.manifest.frameCount) {
+      throw new M49PhysicalSafetyPlaybackContractError("M49 source sequence недопустима.");
+    }
+    return Math.floor(sourceSequence / this.manifest.chunkFrameCount);
+  }
+
+  private async loadChunk(
+    index: number,
+    phase: "prebuffer" | "seek",
+  ): Promise<ResidentChunk> {
+    const existing = this.chunks.get(index);
+    if (existing) {
+      this.chunks.delete(index);
+      this.chunks.set(index, existing);
+      return existing;
+    }
+    const inflight = this.pending.get(index);
+    if (inflight) return inflight;
+    const descriptorValue = this.manifest.chunks[index];
+    if (!descriptorValue) {
+      throw new M49PhysicalSafetyPlaybackContractError("M49 chunk отсутствует.");
+    }
+    const promise = fetchVerified(descriptorValue, this.fetcher, this.signal)
+      .then((buffer) => parseChunk(
+        buffer,
+        descriptorValue,
+        this.manifest.cellCount,
+        this.frames,
+        this.admittedStateCodes,
+      ))
+      .then((chunk) => {
+        this.chunks.set(index, chunk);
+        this.trim(new Set([index]));
+        this.emit(phase);
+        return chunk;
+      })
+      .finally(() => this.pending.delete(index));
+    this.pending.set(index, promise);
+    return promise;
+  }
+
+  private trim(protectedIndexes: ReadonlySet<number>): void {
+    while (this.chunks.size > this.manifest.residentChunkCountMax) {
+      const removable = [...this.chunks.keys()].find((index) => !protectedIndexes.has(index));
+      if (removable === undefined) break;
+      this.chunks.delete(removable);
+    }
+  }
+
+  private emit(phase: M49PhysicalSafetyPlaybackProgress["phase"]): void {
+    this.onProgress?.({
+      phase,
+      residentChunkIndexes: this.residentChunkIndexes,
+      loadedBytes: this.residentByteLength,
+    });
+  }
+}
diff --git a/apps/control-station/src/core/laboratory/m49TgsFullShadow.ts b/apps/control-station/src/core/laboratory/m49TgsFullShadow.ts
index 82eb56e..bd4e7dd 100644
--- a/apps/control-station/src/core/laboratory/m49TgsFullShadow.ts
+++ b/apps/control-station/src/core/laboratory/m49TgsFullShadow.ts
@@ -120,7 +120,7 @@ export interface M49TgsFullShadowPlaybackPack {
   frameCount: 4489;
   cellCount: 2244;
   totalByteLength: number;
-  centersXyM: readonly (readonly [number, number])[];
+  centersXyM: Float32Array;
   states: Uint8Array;
   zBoundsM: Float32Array;
   frames: readonly M49TgsFullShadowPlaybackFrame[];
@@ -628,9 +628,6 @@ export async function fetchM49TgsFullShadowPlaybackPack(
     "<f4",
     centersTrack.shape,
   ) as Float32Array;
-  const centersXyM = Array.from({ length: manifest.cellCount }, (_, index) => (
-    [centersRaw[index * 2]!, centersRaw[index * 2 + 1]!] as const
-  ));
   const states = parseM49TgsNpyTrack(
     buffers.get("states")!,
     "|u1",
@@ -653,7 +650,7 @@ export async function fetchM49TgsFullShadowPlaybackPack(
     frameCount: manifest.frameCount,
     cellCount: manifest.cellCount,
     totalByteLength: manifest.totalByteLength,
-    centersXyM,
+    centersXyM: centersRaw,
     states,
     zBoundsM,
     frames,
diff --git a/apps/control-station/src/core/laboratory/m4ReplayThreat.ts b/apps/control-station/src/core/laboratory/m4ReplayThreat.ts
index bd8127c..14f980d 100644
--- a/apps/control-station/src/core/laboratory/m4ReplayThreat.ts
+++ b/apps/control-station/src/core/laboratory/m4ReplayThreat.ts
@@ -238,6 +238,37 @@ export interface M4ThreatPlaybackPointPack {
   pointCount: number;
   pointOffsets: Uint32Array;
   pointsMapXyzM: Float32Array;
+  pointStart?: number;
+  startSequence?: number;
+  sequenceCount?: number;
+}
+
+export interface M4ThreatPlaybackChunkDescriptor {
+  index: number;
+  start: number;
+  count: number;
+  pointStart: number;
+  pointCount: number;
+  url: string;
+  mediaType: "application/octet-stream";
+  byteLength: number;
+  sha256: string;
+}
+
+export interface M4ThreatPlaybackManifest {
+  resultId: string;
+  frameCount: 4489;
+  pointCount: number;
+  pointOffsets: Uint32Array;
+  chunkFrameCount: 24;
+  residentChunkCountMax: 4;
+  forwardPrefetchChunkCount: 1;
+  chunks: readonly M4ThreatPlaybackChunkDescriptor[];
+  track: {
+    url: string;
+    byteLength: number;
+    sha256: string;
+  };
 }
 
 type LaboratoryFetch = (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
@@ -889,7 +920,14 @@ export function hydrateM4ThreatTimelineFrame(
   frame: M4ThreatTimelineFrame,
   pack: M4ThreatPlaybackPointPack,
 ): M4ThreatTimelineFrame {
-  if (frame.sequence >= pack.frameCount || pack.resultId === "") {
+  if (
+    frame.sequence >= pack.frameCount
+    || pack.resultId === ""
+    || (pack.startSequence !== undefined && (
+      frame.sequence < pack.startSequence
+      || frame.sequence >= pack.startSequence + (pack.sequenceCount ?? 0)
+    ))
+  ) {
     throw new M4ThreatContractError("M4.6 binary playback frame: нарушена идентичность.");
   }
   if (!frame.sourceAvailable || !frame.spatialAvailable || !frame.bodyFrame) {
@@ -900,7 +938,15 @@ export function hydrateM4ThreatTimelineFrame(
   }
   const start = pack.pointOffsets[frame.sequence];
   const stop = pack.pointOffsets[frame.sequence + 1];
-  if (start === undefined || stop === undefined || stop < start || stop > pack.pointCount) {
+  const pointStart = pack.pointStart ?? 0;
+  const pointStop = pointStart + pack.pointCount;
+  if (
+    start === undefined
+    || stop === undefined
+    || stop < start
+    || start < pointStart
+    || stop > pointStop
+  ) {
     throw new M4ThreatContractError("M4.6 binary playback offsets: нарушена размерность.");
   }
   const count = stop - start;
@@ -911,7 +957,7 @@ export function hydrateM4ThreatTimelineFrame(
   const basis = frame.bodyFrame.basisMapFromBody;
   const points = new Array<M4Point3>(count);
   for (let index = 0; index < count; index += 1) {
-    const sourceOffset = (start + index) * 3;
+    const sourceOffset = (start - pointStart + index) * 3;
     const dx = pack.pointsMapXyzM[sourceOffset]! - origin[0];
     const dy = pack.pointsMapXyzM[sourceOffset + 1]! - origin[1];
     const dz = pack.pointsMapXyzM[sourceOffset + 2]! - origin[2];
@@ -924,22 +970,19 @@ export function hydrateM4ThreatTimelineFrame(
   return { ...frame, pointCloudBodyXyzM: points, pointCloudSampleCount: count };
 }
 
-export async function fetchM4ThreatPlaybackPointPack(
+export async function fetchM4ThreatPlaybackManifest(
   result: string,
   {
     fetcher = fetch,
     signal,
     endpointRoot = M4_THREAT_TIMELINE_ENDPOINT_ROOT,
-    onProgress,
   }: {
     fetcher?: LaboratoryFetch;
     signal?: AbortSignal;
     endpointRoot?: string;
-    onProgress?: (progress: M4ThreatPlaybackProgress) => void;
   } = {},
-): Promise<M4ThreatPlaybackPointPack> {
+): Promise<M4ThreatPlaybackManifest> {
   resultId(result);
-  onProgress?.({ phase: "manifest", loadedBytes: 0, totalBytes: 0 });
   const manifestResponse = await fetcher(`${endpointRoot}/${result}/timeline/playback`, {
     headers: { Accept: "application/json" },
     signal,
@@ -982,46 +1025,180 @@ export async function fetchM4ThreatPlaybackPointPack(
   if (!/^[a-f0-9]{64}$/.test(sha256)) {
     throw new M4ThreatContractError("M4.6 playback SHA-256: нарушен контракт.");
   }
-  const response = await fetcher(text(track.url, "M4.6 playback URL"), {
-    headers: { Accept: "application/octet-stream" },
-    signal,
+  const trackUrl = text(track.url, "M4.6 playback URL");
+  const chunkFrameCount = exact(
+    integer(manifest.chunk_frame_count, "M4.6 playback chunk frames"),
+    24,
+    "M4.6 playback chunk frames",
+  );
+  const residentChunkCountMax = exact(
+    integer(manifest.resident_chunk_count_max, "M4.6 playback resident chunks"),
+    4,
+    "M4.6 playback resident chunks",
+  );
+  const forwardPrefetchChunkCount = exact(
+    integer(manifest.forward_prefetch_chunk_count, "M4.6 playback prefetch chunks"),
+    1,
+    "M4.6 playback prefetch chunks",
+  );
+  const chunkRows = array(manifest.chunks, "M4.6 playback chunks");
+  const expectedChunkCount = Math.ceil(frameCount / chunkFrameCount);
+  if (chunkRows.length !== expectedChunkCount) {
+    throw new M4ThreatContractError("M4.6 playback chunk catalog: неверный размер.");
+  }
+  const chunks = chunkRows.map((value, index): M4ThreatPlaybackChunkDescriptor => {
+    const row = object(value, `M4.6 playback chunk ${index}`);
+    const start = index * chunkFrameCount;
+    const count = Math.min(chunkFrameCount, frameCount - start);
+    const pointStart = pointOffsets[start]!;
+    const pointStop = pointOffsets[start + count]!;
+    const pointChunkCount = pointStop - pointStart;
+    exact(integer(row.index, `M4.6 playback chunk ${index}.index`), index, `M4.6 playback chunk ${index}.index`);
+    exact(integer(row.start, `M4.6 playback chunk ${index}.start`), start, `M4.6 playback chunk ${index}.start`);
+    exact(integer(row.count, `M4.6 playback chunk ${index}.count`), count, `M4.6 playback chunk ${index}.count`);
+    exact(integer(row.point_start, `M4.6 playback chunk ${index}.point start`), pointStart, `M4.6 playback chunk ${index}.point start`);
+    exact(integer(row.point_count, `M4.6 playback chunk ${index}.point count`), pointChunkCount, `M4.6 playback chunk ${index}.point count`);
+    exact(row.media_type, "application/octet-stream", `M4.6 playback chunk ${index}.media type`);
+    exact(row.dtype, "<f4", `M4.6 playback chunk ${index}.dtype`);
+    const shapeValue = array(row.shape, `M4.6 playback chunk ${index}.shape`)
+      .map((item) => integer(item, `M4.6 playback chunk ${index}.shape`));
+    const chunkBytes = integer(row.bytes, `M4.6 playback chunk ${index}.bytes`);
+    if (
+      shapeValue.length !== 2
+      || shapeValue[0] !== pointChunkCount
+      || shapeValue[1] !== 3
+      || chunkBytes !== pointChunkCount * 3 * Float32Array.BYTES_PER_ELEMENT
+    ) {
+      throw new M4ThreatContractError(`M4.6 playback chunk ${index}: нарушена размерность.`);
+    }
+    const chunkSha256 = text(row.sha256, `M4.6 playback chunk ${index}.SHA-256`);
+    if (!/^[a-f0-9]{64}$/.test(chunkSha256)) {
+      throw new M4ThreatContractError(`M4.6 playback chunk ${index}: SHA-256 недопустим.`);
+    }
+    const expectedUrl = `${endpointRoot}/${result}/timeline/playback/chunks/${index}`;
+    const url = text(row.url, `M4.6 playback chunk ${index}.URL`);
+    if (url !== expectedUrl || url.includes("worker")) {
+      throw new M4ThreatContractError(`M4.6 playback chunk ${index}: разрешён только sealed local API.`);
+    }
+    return {
+      index,
+      start,
+      count,
+      pointStart,
+      pointCount: pointChunkCount,
+      url,
+      mediaType: "application/octet-stream",
+      byteLength: chunkBytes,
+      sha256: chunkSha256,
+    };
   });
-  if (!response.ok) throw new M4ThreatContractError(`M4.6 playback points: HTTP ${response.status}.`);
-  const bytes = new Uint8Array(byteLength);
-  if (response.body) {
-    const reader = response.body.getReader();
-    let offset = 0;
-    while (true) {
-      const { done, value } = await reader.read();
-      if (done) break;
-      if (offset + value.byteLength > bytes.byteLength) {
-        throw new M4ThreatContractError("M4.6 playback points превысил объявленный размер.");
-      }
-      bytes.set(value, offset);
-      offset += value.byteLength;
-      onProgress?.({ phase: "download", loadedBytes: offset, totalBytes: byteLength });
-    }
-    if (offset !== byteLength) {
-      throw new M4ThreatContractError("M4.6 playback points получен не полностью.");
-    }
-  } else {
-    const fallback = new Uint8Array(await response.arrayBuffer());
-    if (fallback.byteLength !== byteLength) {
-      throw new M4ThreatContractError("M4.6 playback points: неверный размер.");
-    }
-    bytes.set(fallback);
-  }
-  onProgress?.({ phase: "verify", loadedBytes: byteLength, totalBytes: byteLength });
-  if (await playbackSha256Hex(bytes.buffer) !== sha256) {
-    throw new M4ThreatContractError("M4.6 playback points: SHA-256 не совпал.");
-  }
-  onProgress?.({ phase: "ready", loadedBytes: byteLength, totalBytes: byteLength });
   return {
     resultId: result,
     frameCount,
     pointCount,
     pointOffsets,
-    pointsMapXyzM: new Float32Array(bytes.buffer),
+    chunkFrameCount,
+    residentChunkCountMax,
+    forwardPrefetchChunkCount,
+    chunks,
+    track: { url: trackUrl, byteLength, sha256 },
+  };
+}
+
+export async function fetchM4ThreatPlaybackPointChunk(
+  manifest: M4ThreatPlaybackManifest,
+  chunkIndex: number,
+  {
+    fetcher = fetch,
+    signal,
+    onProgress,
+  }: {
+    fetcher?: LaboratoryFetch;
+    signal?: AbortSignal;
+    onProgress?: (progress: M4ThreatPlaybackProgress) => void;
+  } = {},
+): Promise<M4ThreatPlaybackPointPack> {
+  const descriptor = manifest.chunks[chunkIndex];
+  if (!descriptor || descriptor.index !== chunkIndex) {
+    throw new M4ThreatContractError("M4.6 playback chunk отсутствует.");
+  }
+  onProgress?.({ phase: "download", loadedBytes: 0, totalBytes: descriptor.byteLength });
+  const response = await fetcher(descriptor.url, {
+    headers: { Accept: "application/octet-stream" },
+    signal,
+  });
+  if (!response.ok) {
+    throw new M4ThreatContractError(`M4.6 playback chunk: HTTP ${response.status}.`);
+  }
+  const buffer = await response.arrayBuffer();
+  if (buffer.byteLength !== descriptor.byteLength) {
+    throw new M4ThreatContractError("M4.6 playback chunk: неверный размер.");
+  }
+  onProgress?.({
+    phase: "verify",
+    loadedBytes: descriptor.byteLength,
+    totalBytes: descriptor.byteLength,
+  });
+  if (await playbackSha256Hex(buffer) !== descriptor.sha256) {
+    throw new M4ThreatContractError("M4.6 playback chunk: SHA-256 не совпал.");
+  }
+  onProgress?.({
+    phase: "ready",
+    loadedBytes: descriptor.byteLength,
+    totalBytes: descriptor.byteLength,
+  });
+  return {
+    resultId: manifest.resultId,
+    frameCount: manifest.frameCount,
+    pointCount: descriptor.pointCount,
+    pointOffsets: manifest.pointOffsets,
+    pointsMapXyzM: new Float32Array(buffer),
+    pointStart: descriptor.pointStart,
+    startSequence: descriptor.start,
+    sequenceCount: descriptor.count,
+  };
+}
+
+export async function fetchM4ThreatPlaybackPointPack(
+  result: string,
+  {
+    fetcher = fetch,
+    signal,
+    endpointRoot = M4_THREAT_TIMELINE_ENDPOINT_ROOT,
+    onProgress,
+  }: {
+    fetcher?: LaboratoryFetch;
+    signal?: AbortSignal;
+    endpointRoot?: string;
+    onProgress?: (progress: M4ThreatPlaybackProgress) => void;
+  } = {},
+): Promise<M4ThreatPlaybackPointPack> {
+  onProgress?.({ phase: "manifest", loadedBytes: 0, totalBytes: 0 });
+  const manifest = await fetchM4ThreatPlaybackManifest(result, {
+    fetcher,
+    signal,
+    endpointRoot,
+  });
+  const response = await fetcher(manifest.track.url, {
+    headers: { Accept: "application/octet-stream" },
+    signal,
+  });
+  if (!response.ok) throw new M4ThreatContractError(`M4.6 playback points: HTTP ${response.status}.`);
+  const buffer = await response.arrayBuffer();
+  if (buffer.byteLength !== manifest.track.byteLength) {
+    throw new M4ThreatContractError("M4.6 playback points: неверный размер.");
+  }
+  onProgress?.({ phase: "verify", loadedBytes: buffer.byteLength, totalBytes: buffer.byteLength });
+  if (await playbackSha256Hex(buffer) !== manifest.track.sha256) {
+    throw new M4ThreatContractError("M4.6 playback points: SHA-256 не совпал.");
+  }
+  onProgress?.({ phase: "ready", loadedBytes: buffer.byteLength, totalBytes: buffer.byteLength });
+  return {
+    resultId: manifest.resultId,
+    frameCount: manifest.frameCount,
+    pointCount: manifest.pointCount,
+    pointOffsets: manifest.pointOffsets,
+    pointsMapXyzM: new Float32Array(buffer),
   };
 }
 
diff --git a/apps/control-station/src/styles/m4-replay-threat.css b/apps/control-station/src/styles/m4-replay-threat.css
index b0d3d98..5a1c808 100644
--- a/apps/control-station/src/styles/m4-replay-threat.css
+++ b/apps/control-station/src/styles/m4-replay-threat.css
@@ -236,9 +236,10 @@
   box-sizing: border-box;
   min-width: 0;
   align-items: stretch;
-  width: max-content;
-  max-width: calc(var(--m4-replay-threat-overlay-pane-width, 100%) - 1.2rem);
-  grid-template-columns: minmax(0, max-content);
+  width: min(17.5rem, calc(var(--m4-replay-threat-overlay-pane-width, 100%) - 1.2rem));
+  max-width: none;
+  grid-auto-rows: 3.8rem;
+  grid-template-columns: minmax(0, 1fr);
   gap: 0.3rem;
   overflow: hidden;
   background: transparent;
@@ -247,6 +248,9 @@
 }
 
 .m4-replay-threat-visual__overlay > div {
+  box-sizing: border-box;
+  height: 3.8rem;
+  grid-template-rows: auto auto minmax(1.32rem, 1fr);
   border-radius: var(--nodedc-radius-control-compact);
   background: color-mix(in srgb, var(--nodedc-floating-surface) 80%, transparent);
   padding: 0.55rem 0.65rem;
@@ -254,15 +258,24 @@
 }
 
 .m4-replay-threat-visual__overlay span,
-.m4-replay-threat-visual__overlay strong,
-.m4-replay-threat-visual__overlay small {
+.m4-replay-threat-visual__overlay strong {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
+.m4-replay-threat-visual__overlay small {
+  display: -webkit-box;
+  min-height: 1.32rem;
+  overflow: hidden;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 2;
+  white-space: normal;
+}
+
 @media (max-width: 900px) {
   .m4-replay-threat-visual__overlay {
+    width: min(17.5rem, calc(100% - 1.2rem));
     max-width: calc(100% - 1.2rem);
   }
 }
@@ -372,3 +385,13 @@
   background: var(--nodedc-text-muted);
   opacity: 0.42;
 }
+
+.laboratory-metric-evidence-scene__legend span[data-decision="performance"] {
+  font-variant-numeric: tabular-nums;
+}
+
+.laboratory-metric-evidence-scene__legend span[data-decision="performance"]::before {
+  box-sizing: border-box;
+  border: 1px solid rgb(var(--nodedc-accent-rgb));
+  background: transparent;
+}
diff --git a/apps/control-station/src/workspaces/laboratory/M49TgsFullShadowEvidence.tsx b/apps/control-station/src/workspaces/laboratory/M49TgsFullShadowEvidence.tsx
index 56544ec..11c1714 100644
--- a/apps/control-station/src/workspaces/laboratory/M49TgsFullShadowEvidence.tsx
+++ b/apps/control-station/src/workspaces/laboratory/M49TgsFullShadowEvidence.tsx
@@ -8,13 +8,16 @@ import {
   fetchE47SemanticSlamResult,
   type E47SemanticSlamResult,
 } from "../../core/laboratory/e47SemanticSlam";
+import {
+  fetchM49PhysicalSafetyPlaybackIdForSource,
+  M49PhysicalSafetyPlaybackBuffer,
+  type M49PhysicalSafetyPlaybackProgress,
+} from "../../core/laboratory/m49PhysicalSafetyPlayback";
 import {
   fetchM49TgsFullShadowPlaybackPack,
   type M49TgsFullShadowResult,
   type M49TgsFullShadowPlaybackPack,
   type M49TgsFullShadowPlaybackProgress,
-  type M49TgsFullShadowSpatial,
-  type M49TgsFullShadowStateCode,
 } from "../../core/laboratory/m49TgsFullShadow";
 import {
   M4ReplayThreatVisual,
@@ -33,13 +36,6 @@ const PALETTE: readonly RecordedEvidenceSemanticPaletteEntry[] = [
   { classId: 3, color: { kind: "token", token: "--nodedc-warning-rgb" } },
 ];
 
-function cellState(code: M49TgsFullShadowStateCode): M4ReplayClassifiedSpatialFrame["cellsMapGravityLocal"][number]["state"] {
-  if (code === 1) return "ground-support";
-  if (code === 2) return "nonground-occupied";
-  if (code === 3) return "unknown-rejected";
-  return "unobserved";
-}
-
 function message(error: unknown): string {
   return error instanceof Error && error.message.trim()
     ? error.message
@@ -51,6 +47,9 @@ export function M49TgsFullShadowEvidence({ result }: { result: M49TgsFullShadowR
   const [semantic, setSemantic] = useState<E47SemanticSlamResult | null>(null);
   const [semanticError, setSemanticError] = useState<string | null>(null);
   const [playbackPack, setPlaybackPack] = useState<M49TgsFullShadowPlaybackPack | null>(null);
+  const [physicalPlayback, setPhysicalPlayback] = useState<M49PhysicalSafetyPlaybackBuffer | null>(null);
+  const [physicalProgress, setPhysicalProgress] = useState<M49PhysicalSafetyPlaybackProgress | null>(null);
+  const [physicalRevision, setPhysicalRevision] = useState(0);
   const [playbackProgress, setPlaybackProgress] = useState<M49TgsFullShadowPlaybackProgress>({
     phase: "manifest",
     trackId: null,
@@ -83,12 +82,27 @@ export function M49TgsFullShadowEvidence({ result }: { result: M49TgsFullShadowR
   useEffect(() => {
     const controller = new AbortController();
     setPlaybackPack(null);
+    setPhysicalPlayback(null);
+    setPhysicalProgress(null);
+    setPhysicalRevision(0);
     setPlaybackProgress({ phase: "manifest", trackId: null, loadedBytes: 0, totalBytes: 0 });
     setError(null);
-    void fetchM49TgsFullShadowPlaybackPack(result.resultId, {
+    void fetchM49PhysicalSafetyPlaybackIdForSource(result.resultId, {
       signal: controller.signal,
-      onProgress: setPlaybackProgress,
-    }).then((pack) => {
+    }).then(async (physicalResultId) => {
+      if (controller.signal.aborted) return;
+      if (physicalResultId) {
+        const playback = await M49PhysicalSafetyPlaybackBuffer.open(physicalResultId, {
+          signal: controller.signal,
+          onProgress: setPhysicalProgress,
+        });
+        if (!controller.signal.aborted) setPhysicalPlayback(playback);
+        return;
+      }
+      const pack = await fetchM49TgsFullShadowPlaybackPack(result.resultId, {
+        signal: controller.signal,
+        onProgress: setPlaybackProgress,
+      });
       if (!controller.signal.aborted) setPlaybackPack(pack);
     }).catch((caught: unknown) => {
       if (!controller.signal.aborted) setError(message(caught));
@@ -96,69 +110,84 @@ export function M49TgsFullShadowEvidence({ result }: { result: M49TgsFullShadowR
     return () => controller.abort();
   }, [result.resultId]);
 
-  const spatial = useMemo<M49TgsFullShadowSpatial | null>(() => {
-    if (activeSequence === null || !playbackPack) return null;
+  useEffect(() => {
+    if (activeSequence === null || !physicalPlayback) return;
+    let active = true;
+    const resident = physicalPlayback.frameIfResident(activeSequence);
+    void physicalPlayback.prepare(activeSequence).then(() => {
+      if (active && !resident) setPhysicalRevision((value) => value + 1);
+    }).catch((caught: unknown) => {
+      if (active) setError(message(caught));
+    });
+    return () => {
+      active = false;
+    };
+  }, [activeSequence, physicalPlayback]);
+
+  const classifiedFrame = useMemo<M4ReplayClassifiedSpatialFrame | null>(() => {
+    if (activeSequence === null) return null;
+    if (physicalPlayback) {
+      const frame = physicalPlayback.frameIfResident(activeSequence);
+      if (!frame) return null;
+      return {
+        sourceSequence: activeSequence,
+        sampleAvailable: frame.metadata.sampleAvailable,
+        sourcePointCount: frame.metadata.metrics.eligible_point_count ?? 0,
+        pointsMapGravityLocalXyzM: [],
+        pointClassIds: [],
+        cellsMapGravityLocal: [],
+        packedCellsMapGravityLocal: {
+          centersXyM: frame.centersXyM,
+          stateCodes: frame.states,
+          zBoundsM: frame.zBoundsM,
+        },
+        cellSizeM: frame.cellSizeM,
+        classes: CLASSES,
+        palette: PALETTE,
+      };
+    }
+    if (!playbackPack) return null;
     const frame = playbackPack.frames[activeSequence];
     if (!frame) return null;
     const cellOffset = activeSequence * playbackPack.cellCount;
     const zOffset = cellOffset * 2;
-    const states = Array.from(
-      playbackPack.states.subarray(cellOffset, cellOffset + playbackPack.cellCount),
-      (value) => value as M49TgsFullShadowStateCode,
-    );
-    const zBoundsM = Array.from({ length: playbackPack.cellCount }, (_, index) => {
-      const minimum = playbackPack.zBoundsM[zOffset + index * 2]!;
-      const maximum = playbackPack.zBoundsM[zOffset + index * 2 + 1]!;
-      return [
-        Number.isFinite(minimum) ? minimum : null,
-        Number.isFinite(maximum) ? maximum : null,
-      ] as const;
-    });
     return {
-      resultId: playbackPack.resultId,
       sourceSequence: activeSequence,
-      sourceFrameIndex: frame.sourceFrameIndex,
-      sessionSeconds: frame.sessionSeconds,
       sampleAvailable: frame.sampleAvailable,
-      costmap: {
-        cellSizeM: result.configuration.cellSizeM,
-        radiusM: result.configuration.radiusM,
+      sourcePointCount: frame.metrics.eligiblePointCount,
+      pointsMapGravityLocalXyzM: [],
+      pointClassIds: [],
+      cellsMapGravityLocal: [],
+      packedCellsMapGravityLocal: {
         centersXyM: playbackPack.centersXyM,
-        states,
-        zBoundsM,
+        stateCodes: playbackPack.states.subarray(
+          cellOffset,
+          cellOffset + playbackPack.cellCount,
+        ),
+        zBoundsM: playbackPack.zBoundsM.subarray(
+          zOffset,
+          zOffset + playbackPack.cellCount * 2,
+        ),
       },
-      metrics: frame.metrics,
+      cellSizeM: result.configuration.cellSizeM,
+      classes: CLASSES,
+      palette: PALETTE,
     };
-  }, [activeSequence, playbackPack, result.configuration.cellSizeM, result.configuration.radiusM]);
-  const loading = activeSequence !== null && !spatial && !error;
+  }, [activeSequence, physicalPlayback, physicalRevision, playbackPack, result.configuration.cellSizeM]);
+  const loading = activeSequence !== null && !classifiedFrame && !error;
   const progressPercent = playbackProgress.totalBytes > 0
     ? Math.min(100, Math.round((playbackProgress.loadedBytes / playbackProgress.totalBytes) * 100))
     : 0;
-  const loadingLabel = playbackProgress.phase === "manifest"
+  const loadingLabel = physicalProgress
+    ? physicalProgress.phase === "ready"
+      ? "Sealed TGS playback готов"
+      : `Буферизуем sealed TGS · ${physicalProgress.residentChunkIndexes.length}/3 chunks · ${(physicalProgress.loadedBytes / 1_048_576).toFixed(1)} МБ`
+    : playbackProgress.phase === "manifest"
     ? "Проверяем playback manifest"
     : playbackProgress.phase === "ready"
       ? "TGS playback готов"
       : `Подготавливаем TGS playback · ${progressPercent}% · ${(playbackProgress.loadedBytes / 1_048_576).toFixed(1)}/${(playbackProgress.totalBytes / 1_048_576).toFixed(1)} МБ`;
 
-  const classifiedFrame = useMemo<M4ReplayClassifiedSpatialFrame | null>(() => {
-    if (!spatial) return null;
-    return {
-      sourceSequence: spatial.sourceSequence,
-      sampleAvailable: spatial.sampleAvailable,
-      sourcePointCount: spatial.metrics.eligiblePointCount,
-      pointsMapGravityLocalXyzM: [],
-      pointClassIds: [],
-      cellsMapGravityLocal: spatial.costmap.centersXyM.map((center, index) => ({
-        centerXyM: center,
-        zBoundsM: spatial.costmap.zBoundsM[index]!,
-        state: cellState(spatial.costmap.states[index]!),
-      })),
-      cellSizeM: spatial.costmap.cellSizeM,
-      classes: CLASSES,
-      palette: PALETTE,
-    };
-  }, [spatial]);
-
   const handleSequenceChange = useCallback((sequence: number | null) => {
     setActiveSequence(sequence);
   }, []);
diff --git a/apps/control-station/src/workspaces/laboratory/M4ReplayThreatVisual.tsx b/apps/control-station/src/workspaces/laboratory/M4ReplayThreatVisual.tsx
index f3b4ea8..41af4c0 100644
--- a/apps/control-station/src/workspaces/laboratory/M4ReplayThreatVisual.tsx
+++ b/apps/control-station/src/workspaces/laboratory/M4ReplayThreatVisual.tsx
@@ -14,6 +14,7 @@ import {
   LaboratoryMetricEvidenceScene,
   type LaboratoryMetricCellEvidence,
   type LaboratoryMetricEvidenceSceneHandle,
+  type LaboratoryMetricPackedCellEvidence,
   type LaboratoryMetricSceneMode,
 } from "../../components/laboratory/LaboratoryMetricEvidenceScene";
 import { LaboratoryEvidenceViewer } from "../../components/laboratory/LaboratoryEvidenceViewer";
@@ -118,6 +119,11 @@ export interface M4ReplayClassifiedSpatialFrame {
     zBoundsM: readonly [number | null, number | null];
     state: LaboratoryMetricCellEvidence["state"];
   }[];
+  packedCellsMapGravityLocal?: {
+    centersXyM: Float32Array;
+    zBoundsM: Float32Array;
+    stateCodes: Uint8Array;
+  };
   cellSizeM: number;
   classes: readonly RecordedEvidenceSemanticClass[];
   palette: readonly RecordedEvidenceSemanticPaletteEntry[];
@@ -414,19 +420,41 @@ export function M4ReplayThreatVisual({
     resultId: string;
     frame: M4ReplayClassifiedSpatialFrame;
   } | null>(null);
-  if (classifiedSpatialLayer?.frame) {
-    lastClassifiedSpatialFrameRef.current = { resultId, frame: classifiedSpatialLayer.frame };
+  const incomingClassifiedSpatialFrame = classifiedSpatialLayer?.frame ?? null;
+  if (incomingClassifiedSpatialFrame && incomingClassifiedSpatialFrame.sampleAvailable !== false) {
+    lastClassifiedSpatialFrameRef.current = { resultId, frame: incomingClassifiedSpatialFrame };
   }
+  const lastAvailableClassifiedSpatialFrame = lastClassifiedSpatialFrameRef.current?.resultId === resultId
+    ? lastClassifiedSpatialFrameRef.current.frame
+    : null;
+  // `undefined !== false` is true, so the optional-chain form here used to
+  // select `null` during every short chunk miss. That unmounted the WebGL
+  // scene, flashed the alert state and recreated OrbitControls at the default
+  // view on the next frame. Keep the last complete volume until the exact
+  // classified frame is resident again.
   const displayedClassifiedSpatialFrame = classifiedSpatialFrame
-    ?? (lastClassifiedSpatialFrameRef.current?.resultId === resultId
-      ? lastClassifiedSpatialFrameRef.current.frame
-      : null);
+    && classifiedSpatialFrame.sampleAvailable !== false
+    ? classifiedSpatialFrame
+    : lastAvailableClassifiedSpatialFrame ?? classifiedSpatialFrame;
+  const displayedClassifiedFrameHeld = Boolean(
+    classifiedSpatialFrame
+    && displayedClassifiedSpatialFrame
+    && classifiedSpatialFrame.sourceSequence !== displayedClassifiedSpatialFrame.sourceSequence,
+  );
+  const classifiedContextSpatialFrame = displayedClassifiedSpatialFrame
+    ? timelineFrame.availableFrames.find(
+        (candidate) => candidate.spatialAvailable
+          && candidate.sequence === displayedClassifiedSpatialFrame.sourceSequence,
+      ) ?? (spatialFrame?.sequence === displayedClassifiedSpatialFrame.sourceSequence
+        ? spatialFrame
+        : null)
+    : null;
   const replaceClassifiedPointCloud = classifiedSpatialLayer?.replacePointCloud ?? true;
   const nominalSensorHeightM = metadata.timeline?.rig.nominalSensorHeightM ?? 0;
   const mapGravityLocalSensorToBodyGround = useCallback((
     point: readonly [number, number, number],
   ): readonly [number, number, number] => {
-    const basis = activeSpatialFrame?.bodyFrame?.basisMapFromBody;
+    const basis = classifiedContextSpatialFrame?.bodyFrame?.basisMapFromBody;
     const rotated: readonly [number, number, number] = basis ? [
       basis[0][0] * point[0] + basis[1][0] * point[1] + basis[2][0] * point[2],
       basis[0][1] * point[0] + basis[1][1] * point[1] + basis[2][1] * point[2],
@@ -435,7 +463,7 @@ export function M4ReplayThreatVisual({
     // TGS evidence is translation-only map-gravity-local with the current LiDAR
     // as its origin. The metric scene uses the body ground projection as z=0.
     return [rotated[0], rotated[1], rotated[2] + nominalSensorHeightM];
-  }, [activeSpatialFrame?.bodyFrame?.basisMapFromBody, nominalSensorHeightM]);
+  }, [classifiedContextSpatialFrame?.bodyFrame?.basisMapFromBody, nominalSensorHeightM]);
   const classifiedPointsBody = useMemo(
     () => displayedClassifiedSpatialFrame?.pointsMapGravityLocalXyzM.map(
       mapGravityLocalSensorToBodyGround,
@@ -465,20 +493,58 @@ export function M4ReplayThreatVisual({
     }) ?? [],
     [displayedClassifiedSpatialFrame, mapGravityLocalSensorToBodyGround, nominalSensorHeightM],
   );
-  const classifiedCellCounts = useMemo(() => ({
-    ground: classifiedSpatialFrame?.cellsMapGravityLocal.filter(
-      (cell) => cell.state === "ground-support",
-    ).length ?? 0,
-    occupied: classifiedSpatialFrame?.cellsMapGravityLocal.filter(
-      (cell) => cell.state === "nonground-occupied",
-    ).length ?? 0,
-    rejected: classifiedSpatialFrame?.cellsMapGravityLocal.filter(
-      (cell) => cell.state === "unknown-rejected",
-    ).length ?? 0,
-    unobserved: classifiedSpatialFrame?.cellsMapGravityLocal.filter(
-      (cell) => cell.state === "unobserved",
-    ).length ?? 0,
-  }), [classifiedSpatialFrame]);
+  const classifiedPackedCellsBody = useMemo<LaboratoryMetricPackedCellEvidence | undefined>(() => {
+    const packed = displayedClassifiedSpatialFrame?.packedCellsMapGravityLocal;
+    if (!packed) return undefined;
+    const cellCount = packed.stateCodes.length;
+    if (packed.centersXyM.length !== cellCount * 2 || packed.zBoundsM.length !== cellCount * 2) {
+      return undefined;
+    }
+    const centersBodyXyM = new Float32Array(cellCount * 2);
+    const zBoundsM = new Float32Array(cellCount * 2);
+    for (let index = 0; index < cellCount; index += 1) {
+      const body = mapGravityLocalSensorToBodyGround([
+        packed.centersXyM[index * 2]!,
+        packed.centersXyM[index * 2 + 1]!,
+        0,
+      ]);
+      centersBodyXyM[index * 2] = body[0];
+      centersBodyXyM[index * 2 + 1] = body[1];
+      const minimum = packed.zBoundsM[index * 2]!;
+      const maximum = packed.zBoundsM[index * 2 + 1]!;
+      zBoundsM[index * 2] = Number.isFinite(minimum)
+        ? minimum + nominalSensorHeightM
+        : Number.NaN;
+      zBoundsM[index * 2 + 1] = Number.isFinite(maximum)
+        ? maximum + nominalSensorHeightM
+        : Number.NaN;
+    }
+    return { centersBodyXyM, zBoundsM, stateCodes: packed.stateCodes };
+  }, [displayedClassifiedSpatialFrame, mapGravityLocalSensorToBodyGround, nominalSensorHeightM]);
+  const classifiedCellCounts = useMemo(() => {
+    const counts = { ground: 0, occupied: 0, rejected: 0, unobserved: 0 };
+    const packed = classifiedSpatialFrame?.packedCellsMapGravityLocal;
+    if (packed) {
+      for (const code of packed.stateCodes) {
+        if (code === 1) counts.ground += 1;
+        else if (code === 2) counts.occupied += 1;
+        else if (code === 3) counts.rejected += 1;
+        else if (code === 0) counts.unobserved += 1;
+        else counts.rejected += 1;
+      }
+      return counts;
+    }
+    for (const cell of classifiedSpatialFrame?.cellsMapGravityLocal ?? []) {
+      if (cell.state === "ground-support") counts.ground += 1;
+      else if (cell.state === "nonground-occupied") counts.occupied += 1;
+      else if (cell.state === "unknown-rejected") counts.rejected += 1;
+      else counts.unobserved += 1;
+    }
+    return counts;
+  }, [classifiedSpatialFrame]);
+  const classifiedCellCount = classifiedSpatialFrame?.packedCellsMapGravityLocal?.stateCodes.length
+    ?? classifiedSpatialFrame?.cellsMapGravityLocal.length
+    ?? 0;
   const sceneObstacles = useMemo(() => spatialFrame?.metricObstacles.map((obstacle) => ({
     id: obstacle.componentId,
     decision: obstacle.assessment.decision,
@@ -840,14 +906,16 @@ export function M4ReplayThreatVisual({
         <strong>{classifiedSpatialLayer
           ? classifiedSpatialFrame
             ? replaceClassifiedPointCloud
-              ? `${classifiedSpatialFrame.pointsMapGravityLocalXyzM.length.toLocaleString("ru-RU")} TGS points · ${classifiedSpatialFrame.cellsMapGravityLocal.length.toLocaleString("ru-RU")} cells`
-              : `${(activeSpatialFrame?.pointCloudSourceCount ?? classifiedSpatialFrame.sourcePointCount ?? 0).toLocaleString("ru-RU")} source points · ${classifiedSpatialFrame.cellsMapGravityLocal.length.toLocaleString("ru-RU")} TGS cells`
+              ? `${classifiedSpatialFrame.pointsMapGravityLocalXyzM.length.toLocaleString("ru-RU")} TGS points · ${classifiedCellCount.toLocaleString("ru-RU")} cells`
+              : `${(activeSpatialFrame?.pointCloudSourceCount ?? classifiedSpatialFrame.sourcePointCount ?? 0).toLocaleString("ru-RU")} source points · ${classifiedCellCount.toLocaleString("ru-RU")} TGS cells`
             : "TGS spatial buffer"
           : `${currentIncrementObstacles.length} current · ${rollingMapObstacles.length} rolling${metadata.timeline.occupancyProvenanceDelivery ? ` · ${lowStepObstacles.length} low-step` : ""}`}</strong>
         <small>{classifiedSpatialLayer
           ? classifiedSpatialFrame
             ? classifiedSpatialFrame.sampleAvailable === false
-              ? "LiDAR отсутствует · все ячейки принудительно UNOBSERVED · causal rolling 1 s"
+              ? displayedClassifiedFrameHeld && displayedClassifiedSpatialFrame
+                ? `LiDAR отсутствует · current UNOBSERVED · объёмный контекст удержан с frame ${displayedClassifiedSpatialFrame.sourceSequence + 1}`
+                : "LiDAR отсутствует · все ячейки принудительно UNOBSERVED · causal rolling 1 s"
               : activeSpatialFrame
                 ? "map-gravity-local · all eligible points accounted · causal rolling 1 s"
                 : "TGS рассчитан · linked source cloud недоступен для этого кадра"
@@ -987,37 +1055,36 @@ export function M4ReplayThreatVisual({
             </div>
           </div>
         ) : null}
-        {(!classifiedSpatialLayer ? spatialFrame : displayedClassifiedSpatialFrame) ? (
-          <LaboratoryMetricEvidenceScene
-            ref={metricSceneRef}
-            pointCloudBodyXyzM={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
-              ? classifiedPointsBody
-              : activeSpatialFrame?.pointCloudBodyXyzM ?? []}
-            localSurfaceBodyXyzM={localSurface.pointsBodyXyzM}
-            obstacles={displayedClassifiedSpatialFrame ? [] : sceneObstacles}
-            rig={timeline.rig}
-            corridor={timeline.corridor}
-            occupiedVoxelSizeM={displayedClassifiedSpatialFrame?.cellSizeM ?? timeline.occupiedVoxelSizeM}
-            mode={spatialMode}
-            label={`${evidenceLabel} exact current increment, bounded local SLAM surface and rolling occupancy`}
-            showCurrentIncrement={showCurrentIncrement}
-            showLocalSurface={showLocalSurface}
-            showRollingMap={showRollingMap}
-            showLowStep={displayedClassifiedSpatialFrame ? false : showLowStep}
-            pointSemanticClassIds={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
-              ? displayedClassifiedSpatialFrame.pointClassIds
-              : alignedSemanticPointIds}
-            semanticClasses={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
-              ? displayedClassifiedSpatialFrame.classes
-              : semanticClasses}
-            semanticPalette={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
-              ? displayedClassifiedSpatialFrame.palette
-              : semanticPalette}
-            classifiedCells={classifiedCellsBody}
-            classifiedCellSizeM={displayedClassifiedSpatialFrame?.cellSizeM}
-            showClassifiedCells={showRollingMap}
-          />
-        ) : null}
+        <LaboratoryMetricEvidenceScene
+          ref={metricSceneRef}
+          pointCloudBodyXyzM={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
+            ? classifiedPointsBody
+            : classifiedContextSpatialFrame?.pointCloudBodyXyzM ?? []}
+          localSurfaceBodyXyzM={localSurface.pointsBodyXyzM}
+          obstacles={classifiedSpatialLayer ? [] : sceneObstacles}
+          rig={timeline.rig}
+          corridor={timeline.corridor}
+          occupiedVoxelSizeM={displayedClassifiedSpatialFrame?.cellSizeM ?? timeline.occupiedVoxelSizeM}
+          mode={spatialMode}
+          label={`${evidenceLabel} exact current increment, bounded local SLAM surface and rolling occupancy`}
+          showCurrentIncrement={showCurrentIncrement}
+          showLocalSurface={showLocalSurface}
+          showRollingMap={showRollingMap}
+          showLowStep={classifiedSpatialLayer ? false : showLowStep}
+          pointSemanticClassIds={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
+            ? displayedClassifiedSpatialFrame.pointClassIds
+            : alignedSemanticPointIds}
+          semanticClasses={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
+            ? displayedClassifiedSpatialFrame.classes
+            : semanticClasses}
+          semanticPalette={displayedClassifiedSpatialFrame && replaceClassifiedPointCloud
+            ? displayedClassifiedSpatialFrame.palette
+            : semanticPalette}
+          classifiedCells={classifiedCellsBody}
+          classifiedPackedCells={classifiedPackedCellsBody}
+          classifiedCellSizeM={displayedClassifiedSpatialFrame?.cellSizeM}
+          showClassifiedCells={showRollingMap}
+        />
         {classifiedSpatialLayer && !displayedClassifiedSpatialFrame ? (
           <div className="l3-visual-audit__state" role={classifiedSpatialLayer.error ? "alert" : "status"}>
             {classifiedSpatialLayer.loading || displayingBufferedFrame
@@ -1033,7 +1100,10 @@ export function M4ReplayThreatVisual({
         ) : null}
         {classifiedSpatialFrame?.sampleAvailable === false ? (
           <div className="m4-replay-threat-visual__pane-status" role="status">
-            Кадр {classifiedSpatialFrame.sourceSequence + 1}: LiDAR отсутствует; все 2 244 TGS-ячейки явно UNOBSERVED.
+            Кадр {classifiedSpatialFrame.sourceSequence + 1}: LiDAR отсутствует; current safety — все {classifiedCellCount.toLocaleString("ru-RU")} TGS-ячейки UNOBSERVED
+            {displayedClassifiedFrameHeld && displayedClassifiedSpatialFrame
+              ? `; для ориентации удержан последний объёмный контекст кадра ${displayedClassifiedSpatialFrame.sourceSequence + 1}.`
+              : "."}
           </div>
         ) : classifiedSpatialFrame && !activeSpatialFrame ? (
           <div className="m4-replay-threat-visual__pane-status" role="status">
diff --git a/apps/control-station/src/workspaces/laboratory/useM4ThreatTimeline.ts b/apps/control-station/src/workspaces/laboratory/useM4ThreatTimeline.ts
index 6a41838..a9b7b38 100644
--- a/apps/control-station/src/workspaces/laboratory/useM4ThreatTimeline.ts
+++ b/apps/control-station/src/workspaces/laboratory/useM4ThreatTimeline.ts
@@ -2,13 +2,14 @@ import { useEffect, useMemo, useRef, useState } from "react";
 
 import {
   fetchM4ThreatCameraPointOverlay,
-  fetchM4ThreatPlaybackPointPack,
+  fetchM4ThreatPlaybackManifest,
+  fetchM4ThreatPlaybackPointChunk,
   fetchM4ThreatTimeline,
   fetchM4ThreatTimelineChunk,
   M4_THREAT_TIMELINE_ENDPOINT_ROOT,
   selectM4ThreatTimelineSequence,
   type M4ThreatCameraPointOverlay,
-  type M4ThreatPlaybackPointPack,
+  type M4ThreatPlaybackManifest,
   type M4ThreatPlaybackProgress,
   type M4ThreatTimeline,
   type M4ThreatTimelineChunk,
@@ -86,7 +87,7 @@ export function useM4ThreatTimelineFrame({
     () => new Map(),
   );
   const [error, setError] = useState<string | null>(null);
-  const [pointPack, setPointPack] = useState<M4ThreatPlaybackPointPack | null>(null);
+  const [playbackManifest, setPlaybackManifest] = useState<M4ThreatPlaybackManifest | null>(null);
   const [playbackProgress, setPlaybackProgress] = useState<M4ThreatPlaybackProgress>({
     phase: "manifest",
     loadedBytes: 0,
@@ -102,7 +103,7 @@ export function useM4ThreatTimelineFrame({
 
   useEffect(() => {
     const controller = new AbortController();
-    setPointPack(null);
+    setPlaybackManifest(null);
     setPlaybackError(null);
     setPlaybackProgress({ phase: "manifest", loadedBytes: 0, totalBytes: 0 });
     if (!timeline) return () => controller.abort();
@@ -110,15 +111,15 @@ export function useM4ThreatTimelineFrame({
       setPlaybackProgress({ phase: "ready", loadedBytes: 0, totalBytes: 0 });
       return () => controller.abort();
     }
-    void fetchM4ThreatPlaybackPointPack(resultId, {
+    void fetchM4ThreatPlaybackManifest(resultId, {
       signal: controller.signal,
       endpointRoot,
-      onProgress: (progress) => {
-        if (!controller.signal.aborted) setPlaybackProgress(progress);
-      },
     })
-      .then((pack) => {
-        if (!controller.signal.aborted) setPointPack(pack);
+      .then((manifest) => {
+        if (!controller.signal.aborted) {
+          setPlaybackManifest(manifest);
+          setPlaybackProgress({ phase: "ready", loadedBytes: 0, totalBytes: 0 });
+        }
       })
       .catch((caught: unknown) => {
         if (!controller.signal.aborted) {
@@ -157,7 +158,7 @@ export function useM4ThreatTimelineFrame({
   activeChunkStartRef.current = activeChunkStart;
 
   useEffect(() => {
-    if (!timeline || activeChunkStart === null || (binaryPlayback && !pointPack)) return;
+    if (!timeline || activeChunkStart === null || (binaryPlayback && !playbackManifest)) return;
     const starts = m4ThreatChunkWindowStarts(
       activeChunkStart,
       chunkSize,
@@ -168,12 +169,28 @@ export function useM4ThreatTimelineFrame({
       if (chunksRef.current.has(start) || inFlight.current.has(start)) continue;
       const controller = new AbortController();
       inFlight.current.set(start, controller);
-      void fetchM4ThreatTimelineChunk(resultId, start, chunkSize, {
-        signal: controller.signal,
-        endpointRoot,
-        cameraObstacleProjectionDelivery: timeline.cameraObstacleProjectionDelivery,
-        playbackPointPack: binaryPlayback ? pointPack ?? undefined : undefined,
-      })
+      void (async () => {
+        const playbackPointPack = binaryPlayback && playbackManifest
+          ? await fetchM4ThreatPlaybackPointChunk(
+              playbackManifest,
+              Math.floor(start / playbackManifest.chunkFrameCount),
+              {
+                signal: controller.signal,
+                onProgress: (progress) => {
+                  if (!controller.signal.aborted && start === activeChunkStartRef.current) {
+                    setPlaybackProgress(progress);
+                  }
+                },
+              },
+            )
+          : undefined;
+        return fetchM4ThreatTimelineChunk(resultId, start, chunkSize, {
+          signal: controller.signal,
+          endpointRoot,
+          cameraObstacleProjectionDelivery: timeline.cameraObstacleProjectionDelivery,
+          playbackPointPack,
+        });
+      })()
         .then((chunk) => {
           if (controller.signal.aborted) return;
           setChunks((current) => {
@@ -203,7 +220,7 @@ export function useM4ThreatTimelineFrame({
       // loaded first, then the next chunk is prefetched on the following render.
       break;
     }
-  }, [activeChunkStart, binaryPlayback, chunkSize, chunks, endpointRoot, pointPack, resultId, timeline]);
+  }, [activeChunkStart, binaryPlayback, chunkSize, chunks, endpointRoot, playbackManifest, resultId, timeline]);
 
   const activeFrame: M4ThreatTimelineFrame | null = useMemo(() => {
     if (activeSequence === null || activeChunkStart === null) return null;
@@ -230,8 +247,8 @@ export function useM4ThreatTimelineFrame({
       ? "Проверяем M4 playback manifest"
       : playbackProgress.phase === "ready"
         ? "Подготавливаем текущий spatial-кадр"
-        : `${playbackProgress.phase === "verify" ? "Проверяем" : "Загружаем"} M4 spatial playback · ${playbackProgress.totalBytes > 0
-          ? `${Math.min(100, Math.round(playbackProgress.loadedBytes / playbackProgress.totalBytes * 100))}% · ${(playbackProgress.loadedBytes / 1_048_576).toFixed(1)}/${(playbackProgress.totalBytes / 1_048_576).toFixed(1)} МБ`
+        : `${playbackProgress.phase === "verify" ? "Проверяем" : "Буферизуем"} текущий spatial chunk · ${playbackProgress.totalBytes > 0
+          ? `${Math.min(100, Math.round(playbackProgress.loadedBytes / playbackProgress.totalBytes * 100))}% · ${(playbackProgress.loadedBytes / 1_048_576).toFixed(1)} МБ`
           : "0%"}`,
     error: playbackError ?? error,
   };
diff --git a/apps/control-station/test/m48ObjectCentricQuality.test.mjs b/apps/control-station/test/m48ObjectCentricQuality.test.mjs
index 4693109..8e85f5a 100644
--- a/apps/control-station/test/m48ObjectCentricQuality.test.mjs
+++ b/apps/control-station/test/m48ObjectCentricQuality.test.mjs
@@ -691,3 +691,18 @@ test("metric evidence keeps one WebGL renderer while frame labels advance", () =
     /querySelector\("canvas"\)[\s\S]*?setAttribute\("aria-label", label\)[\s\S]*?\}, \[label\]\);/,
   );
 });
+
+test("metric evidence renders on demand while preserving damped camera interaction", () => {
+  const source = readFileSync(
+    new URL("../src/components/laboratory/LaboratoryMetricEvidenceScene.tsx", import.meta.url),
+    "utf8",
+  );
+
+  assert.match(source, /const requestRenderRef = useRef/);
+  assert.match(source, /controls\.addEventListener\("change", requestRender\)/);
+  assert.match(source, /requestRenderRef\.current\(\)/);
+  assert.doesNotMatch(
+    source,
+    /const render = \(\) => \{\s*animationFrame = window\.requestAnimationFrame\(render\)/,
+  );
+});
diff --git a/apps/control-station/test/m49PhysicalSafetyPlayback.test.mjs b/apps/control-station/test/m49PhysicalSafetyPlayback.test.mjs
new file mode 100644
index 0000000..cb49d74
--- /dev/null
+++ b/apps/control-station/test/m49PhysicalSafetyPlayback.test.mjs
@@ -0,0 +1,234 @@
+import assert from "node:assert/strict";
+import { createHash } from "node:crypto";
+import { after, before, test } from "node:test";
+
+import { createServer } from "vite";
+
+let server;
+let M49PhysicalSafetyPlaybackBuffer;
+let fetchM49PhysicalSafetyPlaybackIdForSource;
+
+const resultId = `m49-physical-safety-playback-${"a".repeat(64)}`;
+const endpoint = `/api/v1/laboratory/m49/physical-safety-playback/${resultId}`;
+const frameCount = 160;
+const cellCount = 4;
+
+before(async () => {
+  server = await createServer({
+    appType: "custom",
+    logLevel: "silent",
+    server: { middlewareMode: true },
+  });
+  ({
+    M49PhysicalSafetyPlaybackBuffer,
+    fetchM49PhysicalSafetyPlaybackIdForSource,
+  } = await server.ssrLoadModule(
+    "/src/core/laboratory/m49PhysicalSafetyPlayback.ts",
+  ));
+});
+
+after(async () => {
+  await server?.close();
+});
+
+function sha256(buffer) {
+  return createHash("sha256").update(Buffer.from(buffer)).digest("hex");
+}
+
+function chunk(index) {
+  const start = index * 32;
+  const count = Math.min(32, frameCount - start);
+  const stateBytes = count * cellCount;
+  const zBytes = count * cellCount * 2 * 4;
+  const headerBytes = 28;
+  const padding = (4 - ((headerBytes + stateBytes) % 4)) % 4;
+  const buffer = new ArrayBuffer(headerBytes + stateBytes + padding + zBytes);
+  const bytes = new Uint8Array(buffer);
+  bytes.set(new TextEncoder().encode("MCPSCH01"));
+  const view = new DataView(buffer);
+  view.setUint32(8, start, true);
+  view.setUint32(12, count, true);
+  view.setUint32(16, cellCount, true);
+  view.setUint32(20, stateBytes, true);
+  view.setUint32(24, zBytes, true);
+  const states = new Uint8Array(buffer, headerBytes, stateBytes);
+  states.fill(1);
+  const z = new Float32Array(buffer, headerBytes + stateBytes + padding, count * cellCount * 2);
+  for (let local = 0; local < count; local += 1) {
+    const sequence = start + local;
+    for (let cell = 0; cell < cellCount; cell += 1) {
+      z[(local * cellCount + cell) * 2] = 0;
+      z[(local * cellCount + cell) * 2 + 1] = 0.12;
+    }
+    if (sequence === 17) {
+      states.fill(0, local * cellCount, (local + 1) * cellCount);
+      z.fill(Number.NaN, local * cellCount * 2, (local + 1) * cellCount * 2);
+    }
+  }
+  return buffer;
+}
+
+function fixture() {
+  const centers = new Float32Array([0, 0, 0.15, 0, 0.3, 0, 0.45, 0]).buffer;
+  const frames = new TextEncoder().encode(Array.from({ length: frameCount }, (_, sequence) => (
+    JSON.stringify({
+      source_frame_index: sequence,
+      session_seconds: sequence / 10,
+      sample_available: sequence !== 17,
+      eligible_point_count: sequence === 17 ? 0 : cellCount,
+    })
+  )).join("\n") + "\n").buffer;
+  const chunks = Array.from({ length: Math.ceil(frameCount / 32) }, (_, index) => chunk(index));
+  const manifest = {
+    schema_version: "missioncore.m49-physical-safety-playback/v1",
+    result_id: resultId,
+    created_at_utc: "2026-08-27T12:00:00Z",
+    access: "read-only-sealed-local",
+    identity: { source_result_id: `m49-tgs-full-shadow-${"b".repeat(64)}` },
+    execution: {
+      execution_class: "local-sequential-offline",
+      worker_role: "realtime-only",
+      worker_runtime_dependency: false,
+      worker_requests_required: 0,
+    },
+    authority: {
+      commands_enabled: false,
+      navigation_or_safety_accepted: false,
+      actuation_accepted: false,
+    },
+    playback: {
+      coordinate_frame: "map-gravity-local",
+      source_pace_hz: 10,
+      frame_count: frameCount,
+      cell_count: cellCount,
+      cell_size_m: 0.15,
+      radius_m: 12,
+      state_codes: {
+        UNOBSERVED: 0,
+        GROUND_SUPPORT: 1,
+        NONGROUND_OCCUPIED: 2,
+        UNKNOWN_REJECTED: 3,
+      },
+      chunk_frame_count: 32,
+      startup_prebuffer_chunk_count: 2,
+      resident_chunk_count_max: 3,
+      forward_prefetch_chunk_count: 1,
+      centers: {
+        url: `${endpoint}/tracks/centers`,
+        media_type: "application/octet-stream",
+        byte_length: centers.byteLength,
+        sha256: sha256(centers),
+        dtype: "<f4",
+        shape: [cellCount, 2],
+      },
+      frames: {
+        url: `${endpoint}/tracks/frames`,
+        media_type: "application/x-ndjson",
+        byte_length: frames.byteLength,
+        sha256: sha256(frames),
+        dtype: "ndjson",
+        shape: [frameCount],
+      },
+      chunks: chunks.map((buffer, index) => ({
+        index,
+        start: index * 32,
+        count: Math.min(32, frameCount - index * 32),
+        url: `${endpoint}/chunks/${index}`,
+        media_type: "application/octet-stream",
+        byte_length: buffer.byteLength,
+        sha256: sha256(buffer),
+        header_bytes: 28,
+        format: "mcpsch01-states-u8-aligned-z-bounds-f32le",
+      })),
+    },
+  };
+  const responses = new Map([
+    [`${endpoint}/tracks/centers`, centers],
+    [`${endpoint}/tracks/frames`, frames],
+    ...chunks.map((buffer, index) => [`${endpoint}/chunks/${index}`, buffer]),
+  ]);
+  return { manifest, responses };
+}
+
+test("physical-safety playback opens and seeks with bounded local chunks only", async () => {
+  const { manifest, responses } = fixture();
+  const requested = [];
+  const progress = [];
+  const fetcher = async (input) => {
+    const url = String(input);
+    requested.push(url);
+    if (url === `${endpoint.replace(`/${resultId}`, "")}/results?limit=2&source_result_id=${manifest.identity.source_result_id}`) {
+      return Response.json({
+        schema_version: "missioncore.m49-physical-safety-playback-catalog/v1",
+        worker_runtime_dependency: false,
+        access: "read-only-sealed-local",
+        items: [{
+          result_id: resultId,
+          source_result_id: manifest.identity.source_result_id,
+          worker_runtime_dependency: false,
+          navigation_or_safety_accepted: false,
+        }],
+      });
+    }
+    if (url === `${endpoint}/manifest`) {
+      return Response.json(manifest);
+    }
+    const payload = responses.get(url);
+    return payload
+      ? new Response(payload, { headers: { "Content-Type": "application/octet-stream" } })
+      : new Response(null, { status: 404 });
+  };
+
+  const resolvedResultId = await fetchM49PhysicalSafetyPlaybackIdForSource(
+    manifest.identity.source_result_id,
+    { fetcher },
+  );
+  assert.equal(resolvedResultId, resultId);
+  const playback = await M49PhysicalSafetyPlaybackBuffer.open(resolvedResultId, {
+    fetcher,
+    onProgress: (value) => progress.push(value),
+  });
+
+  assert.deepEqual(playback.residentChunkIndexes, [0, 1]);
+  assert.equal(progress.at(-1).phase, "ready");
+  assert.equal(requested.some((url) => url.includes("worker")), false);
+  const startupRequestCount = requested.length;
+  await playback.prepare(0);
+  await playback.prepare(0);
+  assert.equal(requested.length, startupRequestCount);
+  const missing = await playback.frame(17);
+  assert.equal(missing.metadata.sampleAvailable, false);
+  assert.deepEqual(new Set(missing.states), new Set([0]));
+  assert.equal([...missing.zBoundsM].every((value) => Number.isNaN(value)), true);
+
+  await playback.prepare(100);
+  assert.equal(playback.residentChunkIndexes.length <= 3, true);
+  assert.equal(playback.residentChunkIndexes.includes(3), true);
+  assert.equal(playback.residentChunkIndexes.includes(4), true);
+  const selected = await playback.frame(100);
+  assert.deepEqual([...selected.states], [1, 1, 1, 1]);
+  const maximumResidentBytes = manifest.playback.centers.byte_length
+    + manifest.playback.frames.byte_length
+    + 3 * Math.max(...manifest.playback.chunks.map((value) => value.byte_length));
+  assert.equal(playback.residentByteLength <= maximumResidentBytes, true);
+
+  await playback.prepare(0);
+  assert.equal(playback.residentChunkIndexes.length <= 3, true);
+  assert.equal(playback.residentChunkIndexes.includes(0), true);
+  assert.equal(playback.residentChunkIndexes.includes(1), true);
+  assert.equal(
+    requested.every((url) => url.startsWith("/api/v1/laboratory/m49/physical-safety-playback")),
+    true,
+  );
+});
+
+test("physical-safety playback rejects a manifest that points at Worker", async () => {
+  const { manifest } = fixture();
+  manifest.playback.centers.url = "http://worker-006/centers";
+  await assert.rejects(
+    M49PhysicalSafetyPlaybackBuffer.open(resultId, {
+      fetcher: async () => Response.json(manifest),
+    }),
+    /sealed local API/,
+  );
+});
diff --git a/apps/control-station/test/m49TgsFullShadow.test.mjs b/apps/control-station/test/m49TgsFullShadow.test.mjs
index 47d8a09..a66345b 100644
--- a/apps/control-station/test/m49TgsFullShadow.test.mjs
+++ b/apps/control-station/test/m49TgsFullShadow.test.mjs
@@ -74,24 +74,53 @@ test("M4.9T5 chunk keeps every missing-LiDAR cell explicitly UNOBSERVED", async
   assert.deepEqual(new Set(chunk.frames[0].costmap.states), new Set([0]));
 });
 
-test("M4.9T5 viewer preloads one immutable binary playback pack", async () => {
-  const [source, contract] = await Promise.all([
+test("M4.9T5 viewer prefers autonomous chunks and keeps a sealed legacy fallback", async () => {
+  const [source, visual, scene, contract] = await Promise.all([
     readFile(
       new URL("../src/workspaces/laboratory/M49TgsFullShadowEvidence.tsx", import.meta.url),
       "utf8",
     ),
+    readFile(
+      new URL("../src/workspaces/laboratory/M4ReplayThreatVisual.tsx", import.meta.url),
+      "utf8",
+    ),
+    readFile(
+      new URL("../src/components/laboratory/LaboratoryMetricEvidenceScene.tsx", import.meta.url),
+      "utf8",
+    ),
     readFile(
       new URL("../src/core/laboratory/m49TgsFullShadow.ts", import.meta.url),
       "utf8",
     ),
   ]);
+  assert.match(source, /fetchM49PhysicalSafetyPlaybackIdForSource/);
+  assert.match(source, /M49PhysicalSafetyPlaybackBuffer\.open/);
+  assert.match(source, /physicalPlayback\.frameIfResident/);
+  assert.match(source, /physicalPlayback\.prepare/);
   assert.match(source, /fetchM49TgsFullShadowPlaybackPack/);
   assert.match(source, /playbackProgress/);
   assert.doesNotMatch(source, /fetchM49TgsFullShadowSpatialChunk/);
-  assert.match(source, /sampleAvailable: spatial\.sampleAvailable/);
+  assert.match(source, /sampleAvailable: frame\.sampleAvailable/);
+  assert.match(source, /packedCellsMapGravityLocal/);
+  assert.match(source, /playbackPack\.states\.subarray/);
+  assert.match(source, /playbackPack\.zBoundsM\.subarray/);
+  assert.doesNotMatch(source, /Array\.from\(\s*playbackPack\.states/);
+  assert.doesNotMatch(source, /centersXyM\.map\(/);
   assert.match(source, /fetchE47SemanticSlamResult/);
   assert.match(source, /next\.baseM4ResultId !== result\.source\.linkedVisualResultId/);
   assert.match(source, /semantic=\{semantic \? \{/);
+  assert.match(
+    visual,
+    /classifiedSpatialFrame\s*&&\s*classifiedSpatialFrame\.sampleAvailable !== false/,
+  );
+  assert.doesNotMatch(visual, /classifiedSpatialFrame\?\.sampleAvailable !== false/);
+  assert.match(visual, /timelineFrame\.availableFrames\.find/);
+  assert.match(visual, /<LaboratoryMetricEvidenceScene/);
+  assert.doesNotMatch(
+    visual,
+    /\{\(!classifiedSpatialLayer \? spatialFrame : displayedClassifiedSpatialFrame\) \? \(/,
+  );
+  assert.match(scene, /useEffect\(\(\) => resetView\(\), \[mode, resetView\]\)/);
   assert.match(contract, /linked_semantic_result_id/);
   assert.match(contract, /missioncore\.m49-tgs-full-shadow-playback\/v1/);
 });
diff --git a/apps/control-station/test/m4ReplayThreat.test.mjs b/apps/control-station/test/m4ReplayThreat.test.mjs
index 50bede6..4d6edb7 100644
--- a/apps/control-station/test/m4ReplayThreat.test.mjs
+++ b/apps/control-station/test/m4ReplayThreat.test.mjs
@@ -1,4 +1,5 @@
 import assert from "node:assert/strict";
+import { createHash } from "node:crypto";
 import { readFile } from "node:fs/promises";
 import { after, before, test } from "node:test";
 
@@ -9,6 +10,8 @@ let fetchM4ThreatReplayResult;
 let fetchM4ThreatVisual;
 let fetchM4ThreatTimeline;
 let fetchM4ThreatTimelineChunk;
+let fetchM4ThreatPlaybackManifest;
+let fetchM4ThreatPlaybackPointChunk;
 let fetchM4ThreatCameraPointOverlay;
 let hydrateM4ThreatTimelineFrame;
 let selectM4ThreatTimelineFrame;
@@ -33,6 +36,8 @@ before(async () => {
     fetchM4ThreatVisual,
     fetchM4ThreatTimeline,
     fetchM4ThreatTimelineChunk,
+    fetchM4ThreatPlaybackManifest,
+    fetchM4ThreatPlaybackPointChunk,
     fetchM4ThreatCameraPointOverlay,
     hydrateM4ThreatTimelineFrame,
     selectM4ThreatTimelineFrame,
@@ -373,6 +378,76 @@ test("M4.6 hydrates a lightweight timeline frame from one retained binary point
   assert.equal(typeof hydrateM4ThreatTimelineFrame, "function");
 });
 
+test("M4.6 source cloud opens from one verified bounded chunk instead of the 105 MiB track", async () => {
+  const pointOffsets = [0, ...Array(4489).fill(2)];
+  const points = new Float32Array([11, 20, 30.25, 12, 19.5, 30]);
+  const pointBytes = points.buffer;
+  const pointSha256 = createHash("sha256").update(Buffer.from(pointBytes)).digest("hex");
+  const endpointRoot = "/api/v1/laboratory/m4-threat/results";
+  const chunks = Array.from({ length: 188 }, (_, index) => {
+    const start = index * 24;
+    const count = Math.min(24, 4489 - start);
+    const pointStart = pointOffsets[start];
+    const pointStop = pointOffsets[start + count];
+    const pointCount = pointStop - pointStart;
+    return {
+      index,
+      start,
+      count,
+      point_start: pointStart,
+      point_count: pointCount,
+      url: `${endpointRoot}/${resultId}/timeline/playback/chunks/${index}`,
+      media_type: "application/octet-stream",
+      dtype: "<f4",
+      shape: [pointCount, 3],
+      bytes: pointCount * 3 * 4,
+      sha256: index === 0 ? pointSha256 : "0".repeat(64),
+    };
+  });
+  const manifestPayload = {
+    schema_version: "missioncore.recorded-spatial-playback/v1",
+    result_id: resultId,
+    frame_count: 4489,
+    point_count: 2,
+    point_offsets: pointOffsets,
+    chunk_frame_count: 24,
+    resident_chunk_count_max: 4,
+    forward_prefetch_chunk_count: 1,
+    chunks,
+    track: {
+      id: "points-map-f32",
+      url: `${endpointRoot}/${resultId}/timeline/playback/tracks/points-map-f32`,
+      media_type: "application/octet-stream",
+      dtype: "<f4",
+      shape: [2, 3],
+      bytes: pointBytes.byteLength,
+      sha256: pointSha256,
+    },
+    coordinate_frame: "map",
+    access: "read-only-sealed-binary-playback",
+  };
+  const requested = [];
+  const fetcher = async (input) => {
+    const url = String(input);
+    requested.push(url);
+    if (url.endsWith("/timeline/playback")) return Response.json(manifestPayload);
+    if (url.endsWith("/timeline/playback/chunks/0")) return new Response(pointBytes.slice(0));
+    return new Response(null, { status: 404 });
+  };
+  const manifest = await fetchM4ThreatPlaybackManifest(resultId, { fetcher });
+  const chunk = await fetchM4ThreatPlaybackPointChunk(manifest, 0, { fetcher });
+
+  assert.deepEqual(requested, [
+    `${endpointRoot}/${resultId}/timeline/playback`,
+    `${endpointRoot}/${resultId}/timeline/playback/chunks/0`,
+  ]);
+  assert.equal(chunk.pointCount, 2);
+  assert.equal(chunk.pointStart, 0);
+  assert.equal(chunk.sequenceCount, 24);
+  assert.equal(chunk.pointsMapXyzM.byteLength, 24);
+  assert.equal(requested.some((url) => url.endsWith("points-map-f32")), false);
+});
+
 test("M4.8S timeline binds factory-KB4 camera points through its exact endpoint", async () => {
   const replayResultId = `m48s-fixed-class-detector-lab-${"b".repeat(64)}`;
   const endpointRoot = "/api/v1/laboratory/m48s/fixed-class-detector";
@@ -825,10 +900,15 @@ test("M4.6 viewer keeps media and spatial panes on one playback clock", async ()
   assert.match(visualCss, /width: 33\.333333%/);
   assert.match(visualCss, /flex-flow: column nowrap/);
   assert.match(visualCss, /m4-replay-threat-visual__overlay > div/);
-  assert.match(visualCss, /grid-template-columns: minmax\(0, max-content\)/);
-  assert.match(visualCss, /width: max-content/);
+  assert.match(visualCss, /grid-template-columns: minmax\(0, 1fr\)/);
+  assert.match(visualCss, /width: min\(17\.5rem/);
+  assert.match(visualCss, /grid-auto-rows: 3\.8rem/);
   assert.match(visualCss, /--m4-replay-threat-overlay-pane-width/);
   assert.match(visualCss, /white-space: nowrap/);
+  assert.match(visualCss, /-webkit-line-clamp: 2/);
+  assert.match(visual, /classifiedCellCount/);
+  assert.match(visual, /lastAvailableClassifiedSpatialFrame/);
+  assert.match(visual, /current UNOBSERVED/);
   assert.match(visualCss, /laboratory-metric-evidence-scene__legend/);
   assert.match(visualCss, /bottom: auto/);
   assert.match(videoScene, /<RecordedFmp4Player/);
@@ -842,16 +922,18 @@ test("M4.6 viewer keeps media and spatial panes on one playback clock", async ()
   assert.match(visual, /showLocalSurface/);
   assert.match(
     visual,
-    /pointCloudBodyXyzM=\{displayedClassifiedSpatialFrame && replaceClassifiedPointCloud[\s\S]*\? classifiedPointsBody[\s\S]*: activeSpatialFrame\?\.pointCloudBodyXyzM \?\? \[\]\}/,
+    /pointCloudBodyXyzM=\{displayedClassifiedSpatialFrame && replaceClassifiedPointCloud[\s\S]*\? classifiedPointsBody[\s\S]*: classifiedContextSpatialFrame\?\.pointCloudBodyXyzM \?\? \[\]\}/,
   );
   assert.match(
     visual,
-    /const classifiedSpatialFrame = classifiedSpatialLayer\?\.frame\?\.sourceSequence === timelineFrame\.activeSequence[\s\S]*const displayedClassifiedSpatialFrame = classifiedSpatialFrame[\s\S]*lastClassifiedSpatialFrameRef/,
+    /const classifiedSpatialFrame = classifiedSpatialLayer\?\.frame\?\.sourceSequence === timelineFrame\.activeSequence[\s\S]*lastClassifiedSpatialFrameRef[\s\S]*const displayedClassifiedSpatialFrame = classifiedSpatialFrame\s*&&\s*classifiedSpatialFrame\.sampleAvailable !== false/,
   );
+  assert.doesNotMatch(visual, /classifiedSpatialFrame\?\.sampleAvailable !== false/);
+  assert.match(visual, /timelineFrame\.availableFrames\.find/);
   assert.match(visual, /localSurfaceBodyXyzM=\{localSurface\.pointsBodyXyzM\}/);
   assert.match(visual, /showLocalSurface=\{showLocalSurface\}/);
   assert.match(visual, /\{semantic \? \([\s\S]*>\s*SEMANTICS\s*<\/Button>/);
-  assert.match(visual, /все 2 244 TGS-ячейки явно UNOBSERVED/);
+  assert.match(visual, /current safety — все \{classifiedCellCount\.toLocaleString\("ru-RU"\)\} TGS-ячейки UNOBSERVED/);
   assert.match(
     visual,
     /mapGravityLocalSensorToBodyGround[\s\S]*rotated\[2\] \+ nominalSensorHeightM/,
diff --git a/apps/control-station/test/recordedCameraBuffering.test.mjs b/apps/control-station/test/recordedCameraBuffering.test.mjs
index 5d0720b..2c5de07 100644
--- a/apps/control-station/test/recordedCameraBuffering.test.mjs
+++ b/apps/control-station/test/recordedCameraBuffering.test.mjs
@@ -173,6 +173,9 @@ test("recorded player keeps full-archive range fallback and uses bounded generat
   assert.match(source, /pumpRecordedSegmentWindow/);
   assert.match(source, /waitForRecordedVideoTarget/);
   assert.match(source, /removeRecordedMediaRange/);
+  assert.match(source, /hasPresentedFrame/);
+  assert.match(source, /retainForwardFrame/);
+  assert.match(source, /candidateTarget\.sequence >= previousTarget\.sequence/);
 
   assert.equal(recordedMediaDecodeStartSequence([1, 1491, 1501], 1500), 1491);
   assert.deepEqual(
diff --git a/apps/control-station/test/semanticEvidencePrimitives.test.mjs b/apps/control-station/test/semanticEvidencePrimitives.test.mjs
index f7ea90a..3bec288 100644
--- a/apps/control-station/test/semanticEvidencePrimitives.test.mjs
+++ b/apps/control-station/test/semanticEvidencePrimitives.test.mjs
@@ -57,7 +57,10 @@ test("metric evidence keeps missing semantic assignments as context and exposes
   assert.match(source, /recordedEvidenceSemanticCssColor/);
   assert.match(source, /DynamicDrawUsage/);
   assert.match(source, /classifiedMeshesRef/);
+  assert.match(source, /classifiedPackedCells/);
   assert.match(source, /updatePointPositions/);
+  assert.match(source, /renderer\.info\.render\.calls/);
+  assert.match(source, /data-decision="performance"/);
 });
 
 test("semantic point alignment follows the last qualified spatial increment", async () => {
diff --git a/config/perception/m49-physical-safety-shadow-v0.json b/config/perception/m49-physical-safety-shadow-v0.json
new file mode 100644
index 0000000..e641167
--- /dev/null
+++ b/config/perception/m49-physical-safety-shadow-v0.json
@@ -0,0 +1,107 @@
+{
+  "schema_version": "missioncore.m49-physical-safety-shadow-profile/v1",
+  "profile_id": "m49-mission-core-rover-physical-safety-shadow/v0",
+  "status": "planning-only-unqualified",
+  "vehicle": {
+    "source": "operator-supplied-2026-08-27-unverified",
+    "body_length_m": 1.0,
+    "body_width_m": 0.8,
+    "body_height_m": 0.4,
+    "ground_clearance_m": 0.15,
+    "nominal_mass_kg": 100.0,
+    "mass_qualification": "estimate-not-weighed",
+    "provisional_centered_footprint_body_xy_m": [
+      [0.5, 0.4],
+      [0.5, -0.4],
+      [-0.5, -0.4],
+      [-0.5, 0.4]
+    ],
+    "nominal_speed_mps": 0.2777777778,
+    "maximum_operating_speed_mps": 0.5555555556,
+    "drive": {
+      "motor_count": 2,
+      "rated_power_per_motor_w": 500.0,
+      "motor_per_side": true,
+      "steering_model": "unqualified-likely-differential"
+    }
+  },
+  "unresolved_physical_inputs": [
+    "measured-mass-and-center-of-gravity",
+    "wheel-diameter-and-width",
+    "wheelbase-track-and-overhangs",
+    "qualified-base-link-origin",
+    "controller-braking-and-loss-of-power-behavior",
+    "measured-stopping-envelope",
+    "maximum-step-slope-and-side-slope",
+    "lidar-camera-to-body-extrinsics",
+    "negative-obstacle-sensor-coverage"
+  ],
+  "terrain_evidence": {
+    "accepted_baseline_profile": "m49-tgs-full-shadow-v1.json",
+    "accepted_baseline_cell_size_m": 0.45,
+    "baseline_mutation_allowed": false,
+    "challenger_cell_sizes_m": [0.15, 0.1],
+    "challenger_radius_m": 12.0,
+    "missing_support_policy": "stop-never-free",
+    "required_states": [
+      "SUPPORTED",
+      "RIGID_OR_UNKNOWN_OBSTACLE",
+      "NEGATIVE_OR_UNSUPPORTED",
+      "VEGETATION_UNKNOWN",
+      "VEGETATION_POTENTIALLY_TRAVERSABLE",
+      "VEGETATION_WITH_RIGID_GEOMETRY"
+    ]
+  },
+  "operator_visual": {
+    "host_profile": "14-inch-2023-macbook-pro-18-gib",
+    "worker_role": "realtime-only",
+    "lab_artifact_generation": "local-sequential-offline-or-imported-sealed",
+    "lab_build_may_take_longer_than_source_duration": true,
+    "source_pace_hz": 10.0,
+    "render_policy": "on-demand-with-interaction-damping",
+    "transport": "sealed-local-binary-chunks-no-per-cell-json",
+    "worker_runtime_dependency": false,
+    "sealed_artifact_required": true,
+    "offline_worker_open_required": true,
+    "full_session_high_resolution_preload_allowed": false,
+    "playback_buffer": {
+      "chunk_frame_count": 32,
+      "startup_prebuffer_chunk_count": 2,
+      "startup_prebuffer_seconds": 6.4,
+      "resident_chunk_count_max": 3,
+      "resident_window_seconds_max": 9.6,
+      "forward_prefetch_chunk_count": 1,
+      "backward_seek_policy": "load-target-and-next-from-sealed-local-artifact"
+    },
+    "lod": {
+      "safety_computation_reduced_by_visual_lod": false,
+      "near_field_radius_m": 4.0,
+      "near_field_cell_size_m": 0.15,
+      "mid_field_radius_m": 8.0,
+      "mid_field_cell_size_m": 0.3,
+      "far_field_radius_m": 12.0,
+      "far_field_cell_size_m": 0.45,
+      "paused_active_frame_full_resolution_available": true
+    },
+    "acceptance_budget": {
+      "main_thread_frame_prepare_p95_ms_max": 10.0,
+      "webgl_render_submit_p95_ms_target": 16.7,
+      "webgl_render_submit_p95_ms_max": 33.3,
+      "evidence_to_visible_p95_ms_max": 100.0,
+      "incremental_resident_memory_mib_max": 256.0,
+      "post_warmup_memory_growth_mib_max": 32.0,
+      "long_task_over_50ms_count_max": 0,
+      "webgl_context_loss_count_max": 0,
+      "worker_unavailable_open_failure_count_max": 0,
+      "worker_request_count_during_lab_open_max": 0,
+      "worker_request_count_during_lab_build_max": 0
+    }
+  },
+  "authority": {
+    "commands_enabled": false,
+    "navigation_accepted": false,
+    "safety_accepted": false,
+    "actuation_accepted": false,
+    "physical_test_accepted": false
+  }
+}
diff --git a/docs/adr/0043-physical-safety-shadow-and-bounded-operator-visual.md b/docs/adr/0043-physical-safety-shadow-and-bounded-operator-visual.md
new file mode 100644
index 0000000..e809264
--- /dev/null
+++ b/docs/adr/0043-physical-safety-shadow-and-bounded-operator-visual.md
@@ -0,0 +1,186 @@
+# ADR 0043: Physical safety shadow and bounded operator visual
+
+Date: 2026-08-27
+Status: autonomous transport slice implemented; 0.15 m challenger and measured acceptance incomplete
+
+## Context
+
+Mission Core has accepted a source-paced RF-DETR-native plus TRAVEL TGS
+recorded shadow on RAVNOVES00. The retained TGS result uses a `0.45 m` cell,
+`12 m` radius and four explicit states. It is useful operator evidence but is
+not a planner-authoritative terrain provider. The integrated acceptance joins
+TGS and the reference graph as evidence; TGS does not modify graph state.
+
+The intended physical rover is not a lightweight laboratory fixture. The
+operator supplied the following planning facts, not yet independently measured:
+
+- body `1.0 x 0.8 x 0.4 m`;
+- ground clearance `0.15 m`;
+- mass approximately `100 kg`;
+- one nominal `500 W` motor per side;
+- nominal speed `0.2778 m/s` (`1 km/h`);
+- maximum operating speed `0.5556 m/s` (`2 km/h`).
+
+Controller, remote dead-man, braking behavior, physical E-stop, body/sensor
+extrinsics, center of gravity and negative-obstacle coverage are unavailable.
+Commands therefore remain disabled.
+
+The current full TGS playback pack is about `88 MiB`: approximately `9.6 MiB`
+states, `77 MiB` z-bounds and `1.1 MiB` frame metadata. Holding the same
+`12 m` disk for all `4,489` frames would scale to roughly `0.8 GiB` at `0.15 m`
+and `1.8 GiB` at `0.10 m`, before richer terrain features, video, semantics and
+renderer allocations. Full-session high-resolution browser preload is not an
+admitted design for the current 18 GiB MacBook host.
+
+## Decision
+
+Recorded LAB and realtime perception are different runtime contours. Worker
+006 is reserved for realtime perception. A new recorded LAB is built by a
+bounded sequential offline builder on the MacBook, or admits an already sealed
+immutable artifact. The offline build may take longer than source duration. It
+must not become a hidden Worker job. An opened LAB never depends on Worker 006.
+
+```text
+recorded LAB publication, Worker 006 absent
+recorded source -> local sequential offline build
+                -> seal immutable result + binary LOD tracks
+                                      |
+                                      v
+                           local/CAS artifact store
+                                      |
+                         Worker 006 remains absent
+                                      |
+                                      v
+                     canonical local backend, read-only
+                                      |
+                                      v
+                    MacBook LAB CAMERA + 3D + PLAN
+
+separate future realtime contour
+K1 -> Worker 006 -> live world-state/planner shadow
+```
+
+Opening, seeking, looping and visually inspecting a sealed LAB must perform
+zero requests to Worker 006. If the worker, its host, Docker or the network path
+to it is unavailable, a locally present sealed result opens unchanged. If a
+manifest-declared local object is absent or corrupt, LAB fails with an explicit
+artifact error; it does not start compute, scan worker results or silently
+rebuild evidence. This preserves ADR 0033.
+
+Publishing a new LAB also performs zero Worker requests. Slow local preparation
+is acceptable, but it is explicit and bounded: build first, seal second, open
+third. Historical LAB artifacts that were originally computed on Worker 006
+remain valid after sealing because replay depends only on their immutable
+artifacts; they do not justify a Worker dependency for new LABs.
+
+Visual performance may never change a safety state, erase unknown space or
+reduce the resolution used by the safety consumer. Conversely, the MacBook does
+not need every cell of every high-resolution frame resident at once in order to
+provide a complete operator explanation.
+
+The retained `0.45 m` M49T5 profile and sealed result remain immutable. A new
+physical-safety challenger may evaluate `0.15 m` and `0.10 m` cells without
+rewriting that baseline. The first candidate resolution is `0.15 m`; `0.10 m`
+is admitted only if LiDAR density improves the evidence. Worker compute
+acceptance and autonomous LAB viewer acceptance are measured separately.
+
+The operator transport uses binary typed arrays. It must not serialize one JSON
+object per cell or expand binary frames into nested JavaScript objects before
+updating GPU instances. Recorded high-resolution inspection reads only sealed
+local binary chunks and active-frame detail, not a full-session high-resolution
+preload.
+
+The proposed spatial chunk is `32` source frames (`3.2 s` at `10 Hz`). Before
+the spatial scene declares itself ready, it may preload the first two chunks,
+or `6.4 s`, from the local artifact. The browser retains at most three chunks
+(`9.6 s`), normally previous/current/next, and prefetches one forward chunk.
+A backward seek loads the target and next chunk from the same sealed artifact.
+This bounded startup delay is preferable to either Worker dependency or a
+multi-gigabyte browser preload.
+
+## Implemented autonomous transport slice
+
+The first executable transport slice is now present without creating a new LAB
+surface or transport clock:
+
+- `m49_physical_safety_playback.py` is a local, sequential, filesystem-only
+  sealer. It accepts an already sealed source, verifies its declared hashes,
+  and writes immutable binary chunks atomically. It contains no Worker client,
+  job submission or network path.
+- `m49_physical_safety_playback_api.py` exposes only the configured local
+  artifact root. Manifest, shared centers, frame catalog and every requested
+  chunk are hash-verified. Corruption returns an explicit artifact failure.
+- `m49PhysicalSafetyPlayback.ts` rejects non-canonical URLs, verifies byte
+  length and SHA-256 in the browser, prebuffers two chunks, retains no more than
+  three and loads target plus next on seek.
+- the existing M49 evidence composition resolves this transport by exact
+  `source_result_id`. If no chunked derivative has been published, it may still
+  read the old sealed local full pack; neither path uses Worker 006.
+
+A real transport canary was generated from the accepted immutable `0.45 m`
+M49T5 result without recomputing TGS or changing that source result. The canary
+identity is
+`m49-physical-safety-playback-0d0e41a995a902a4701935a79655d93f2f1898806f8fa82ebbd207129f111d69`.
+It contains all `4,489` frames and `2,244` cells in `141` chunks. A normal
+32-frame chunk is `646,300` bytes; two startup chunks are about `1.23 MiB` and
+three spatial chunks are about `1.85 MiB`, plus the shared centers and frame
+catalog. This is the transport canary only. It is not a `0.15 m` safety result
+and no upsampled baseline is presented as new evidence.
+
+The `0.15 m` shape, fail-closed missing-sample rule, bounded seek behavior and
+zero-Worker URL policy are covered with synthetic contract fixtures. A real
+`0.15 m` challenger still requires the local sequential terrain computation
+and a separately sealed result.
+
+The visual uses explicit LOD:
+
+- `0-4 m`: `0.15 m` near-field cells;
+- `4-8 m`: `0.30 m` explanatory cells;
+- `8-12 m`: `0.45 m` context cells;
+- pause/anchor inspection: full available active-frame resolution.
+
+LOD changes only presentation. The sealed result retains the full candidate
+evidence needed to reproduce its decisions; a future realtime worker separately
+retains the full live safety grid across the configured safety radius.
+
+The metric Three.js scene retains instanced meshes and all evidence layers. It
+renders on evidence, camera interaction, resize or layer changes. It does not
+run a permanent animation loop while idle. The scene exposes render-pass time,
+draw calls, triangles, cell count and pixel ratio in the operator surface.
+
+## Acceptance budget
+
+Acceptance is measured on the named 14-inch 2023 MacBook Pro with 18 GiB RAM,
+with recorded video, semantic overlay and TGS 3D/PLAN evidence available:
+
+- source pace: `10 Hz` without evidence loss;
+- main-thread frame preparation p95 at most `10 ms`;
+- CPU-side WebGL render submission p95 target `16.7 ms`, hard maximum
+  `33.3 ms`; GPU completion requires a separate supported timer query;
+- evidence-to-visible p95 at most `100 ms`;
+- incremental visual resident memory at most `256 MiB`;
+- post-warmup growth at most `32 MiB` over a ten-minute soak;
+- zero browser long tasks above `50 ms` during source-paced playback;
+- zero WebGL context losses;
+- zero Worker 006 requests while opening, seeking or playing a LAB;
+- zero Worker 006 requests while building a new recorded LAB;
+- the sealed LAB opens with Worker 006 unavailable;
+- idle metric scene performs no continuous render loop.
+
+These are proposed thresholds until a canonical browser run emits a sealed
+performance ledger. Passing them does not grant navigation, safety or actuation
+authority.
+
+## Consequences
+
+- The operator keeps the full explanatory visual instead of receiving a
+  stripped-down safety UI.
+- High-resolution terrain work does not turn the MacBook into a second
+  perception worker.
+- Historical LAB remains usable during Worker maintenance, Docker failure or
+  loss of the Worker network path.
+- Evidence identity and safety decisions remain independent of display LOD.
+- The next implementation boundary is a packed, chunked terrain contract plus
+  footprint-aware states; no physical connection or command path is introduced.
+- Physical authority remains blocked by controller/E-stop, measured braking,
+  vehicle geometry, sensor extrinsics and negative-obstacle coverage.
diff --git a/scripts/build_m49_physical_safety_playback.py b/scripts/build_m49_physical_safety_playback.py
new file mode 100644
index 0000000..1d89bd9
--- /dev/null
+++ b/scripts/build_m49_physical_safety_playback.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""Seal a local M49 playback without contacting Worker 006."""
+
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+from k1link.laboratory.m49_physical_safety_playback import (
+    seal_m49_physical_safety_playback,
+)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(
+        description="Build an autonomous sealed M49 physical-safety playback artifact."
+    )
+    parser.add_argument("--source-root", type=Path, required=True)
+    parser.add_argument("--destination-root", type=Path, required=True)
+    parser.add_argument(
+        "--profile",
+        type=Path,
+        default=Path("config/perception/m49-physical-safety-shadow-v0.json"),
+    )
+    arguments = parser.parse_args()
+    result = seal_m49_physical_safety_playback(
+        source_root=arguments.source_root,
+        destination_root=arguments.destination_root,
+        profile_path=arguments.profile,
+    )
+    print(result.result_id)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/k1link/laboratory/m49_physical_safety_playback.py b/src/k1link/laboratory/m49_physical_safety_playback.py
new file mode 100644
index 0000000..59b155b
--- /dev/null
+++ b/src/k1link/laboratory/m49_physical_safety_playback.py
@@ -0,0 +1,538 @@
+"""Build and verify autonomous chunked M49 physical-safety playback artifacts."""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import math
+import shutil
+import struct
+import tempfile
+from dataclasses import dataclass
+from datetime import UTC, datetime
+from pathlib import Path
+from typing import Any, Final
+
+import numpy as np
+
+SCHEMA: Final = "missioncore.m49-physical-safety-playback/v1"
+PROFILE_SCHEMA: Final = "missioncore.m49-physical-safety-shadow-profile/v1"
+PREFIX: Final = "m49-physical-safety-playback-"
+CHUNK_MAGIC: Final = b"MCPSCH01"
+CHUNK_HEADER: Final = struct.Struct("<8sIIIII")
+SOURCE_TRACKS: Final = (
+    "costmap-cell-centers-xy-m.npy",
+    "costmap-states.npy",
+    "costmap-z-bounds-m.npy",
+    "frames.ndjson",
+)
+_HASH_BLOCK_BYTES: Final = 1024 * 1024
+_MAX_JSON_BYTES: Final = 4 * 1024 * 1024
+
+
+class M49PhysicalSafetyPlaybackError(RuntimeError):
+    """The autonomous playback artifact is missing or violates its contract."""
+
+
+@dataclass(frozen=True, slots=True)
+class M49PhysicalSafetyPlayback:
+    result_id: str
+    root: Path
+    manifest: dict[str, Any]
+
+
+def _sha256(path: Path) -> str:
+    digest = hashlib.sha256()
+    with path.open("rb") as stream:
+        for block in iter(lambda: stream.read(_HASH_BLOCK_BYTES), b""):
+            digest.update(block)
+    return digest.hexdigest()
+
+
+def _canonical_sha256(value: object) -> str:
+    content = json.dumps(
+        value,
+        ensure_ascii=False,
+        sort_keys=True,
+        separators=(",", ":"),
+        allow_nan=False,
+    ).encode("utf-8")
+    return hashlib.sha256(content).hexdigest()
+
+
+def _json(path: Path, label: str) -> dict[str, Any]:
+    if path.is_symlink() or not path.is_file() or path.stat().st_size > _MAX_JSON_BYTES:
+        raise M49PhysicalSafetyPlaybackError(f"{label} is unavailable")
+    try:
+        value = json.loads(path.read_text(encoding="utf-8-sig"))
+    except (OSError, UnicodeDecodeError, json.JSONDecodeError) as error:
+        raise M49PhysicalSafetyPlaybackError(f"{label} is invalid") from error
+    if not isinstance(value, dict):
+        raise M49PhysicalSafetyPlaybackError(f"{label} is invalid")
+    return value
+
+
+def _artifact(path: Path, *, media_type: str, role: str) -> dict[str, object]:
+    return {
+        "path": path.name,
+        "media_type": media_type,
+        "role": role,
+        "byte_length": path.stat().st_size,
+        "sha256": _sha256(path),
+    }
+
+
+def _source_artifacts(source: Path, manifest: dict[str, Any]) -> dict[str, dict[str, Any]]:
+    artifacts = manifest.get("artifacts")
+    if not isinstance(artifacts, list):
+        raise M49PhysicalSafetyPlaybackError("source artifact catalog is unavailable")
+    result: dict[str, dict[str, Any]] = {}
+    for value in artifacts:
+        if not isinstance(value, dict) or not isinstance(value.get("path"), str):
+            raise M49PhysicalSafetyPlaybackError("source artifact catalog is invalid")
+        name = value["path"]
+        if name in (*SOURCE_TRACKS, "report.json"):
+            path = source / name
+            if (
+                path.parent != source
+                or path.is_symlink()
+                or not path.is_file()
+                or value.get("byte_length") != path.stat().st_size
+                or value.get("sha256") != _sha256(path)
+            ):
+                raise M49PhysicalSafetyPlaybackError(f"source artifact changed: {name}")
+            result[name] = value
+    if set(result) != {*SOURCE_TRACKS, "report.json"}:
+        raise M49PhysicalSafetyPlaybackError("source spatial tracks are incomplete")
+    return result
+
+
+def _state_codes(report: dict[str, Any]) -> dict[str, int]:
+    candidates = (
+        report.get("state_codes"),
+        report.get("visual_review", {}).get("state_codes")
+        if isinstance(report.get("visual_review"), dict)
+        else None,
+    )
+    for candidate in candidates:
+        if not isinstance(candidate, dict):
+            continue
+        parsed = {
+            str(name): int(code)
+            for name, code in candidate.items()
+            if isinstance(name, str)
+            and isinstance(code, int)
+            and not isinstance(code, bool)
+            and 0 <= code <= 255
+        }
+        if len(parsed) == len(candidate) and parsed.get("UNOBSERVED") == 0:
+            return parsed
+    raise M49PhysicalSafetyPlaybackError("source state codes are unavailable")
+
+
+def _frame_rows(path: Path) -> tuple[dict[str, Any], ...]:
+    rows: list[dict[str, Any]] = []
+    try:
+        with path.open("r", encoding="utf-8") as stream:
+            for sequence, line in enumerate(stream):
+                value = json.loads(line)
+                if (
+                    not isinstance(value, dict)
+                    or not isinstance(value.get("sample_available"), bool)
+                    or not isinstance(value.get("source_frame_index"), int)
+                    or isinstance(value.get("source_frame_index"), bool)
+                    or not isinstance(value.get("session_seconds"), (int, float))
+                    or isinstance(value.get("session_seconds"), bool)
+                    or not math.isfinite(float(value["session_seconds"]))
+                ):
+                    raise M49PhysicalSafetyPlaybackError(
+                        f"source frame catalog changed at sequence {sequence}"
+                    )
+                rows.append(value)
+    except (OSError, UnicodeDecodeError, json.JSONDecodeError) as error:
+        raise M49PhysicalSafetyPlaybackError("source frame catalog is invalid") from error
+    if not rows:
+        raise M49PhysicalSafetyPlaybackError("source frame catalog is empty")
+    return tuple(rows)
+
+
+def _source_geometry(report: dict[str, Any]) -> tuple[float, float, str]:
+    configuration = report.get("configuration")
+    if not isinstance(configuration, dict):
+        raise M49PhysicalSafetyPlaybackError("source geometry is unavailable")
+    cell_size = configuration.get("cell_size_m")
+    radius = configuration.get("radius_m")
+    coordinate_frame = configuration.get("coordinate_frame")
+    if (
+        not isinstance(cell_size, (int, float))
+        or isinstance(cell_size, bool)
+        or not math.isfinite(float(cell_size))
+        or float(cell_size) <= 0
+        or not isinstance(radius, (int, float))
+        or isinstance(radius, bool)
+        or not math.isfinite(float(radius))
+        or float(radius) <= 0
+        or coordinate_frame != "map-gravity-local"
+    ):
+        raise M49PhysicalSafetyPlaybackError("source geometry changed")
+    return float(cell_size), float(radius), coordinate_frame
+
+
+def _profile_policy(profile: dict[str, Any], cell_size_m: float) -> dict[str, int]:
+    visual = profile.get("operator_visual")
+    terrain = profile.get("terrain_evidence")
+    if (
+        profile.get("schema_version") != PROFILE_SCHEMA
+        or not isinstance(visual, dict)
+        or not isinstance(terrain, dict)
+        or visual.get("worker_role") != "realtime-only"
+        or visual.get("worker_runtime_dependency") is not False
+        or visual.get("sealed_artifact_required") is not True
+    ):
+        raise M49PhysicalSafetyPlaybackError("physical-safety profile changed")
+    playback = visual.get("playback_buffer")
+    admitted_sizes = [
+        terrain.get("accepted_baseline_cell_size_m"),
+        *(terrain.get("challenger_cell_sizes_m") or []),
+    ]
+    if (
+        not isinstance(playback, dict)
+        or playback.get("chunk_frame_count") != 32
+        or playback.get("startup_prebuffer_chunk_count") != 2
+        or playback.get("resident_chunk_count_max") != 3
+        or not any(
+            isinstance(value, (int, float))
+            and not isinstance(value, bool)
+            and math.isclose(float(value), cell_size_m, abs_tol=1e-9)
+            for value in admitted_sizes
+        )
+    ):
+        raise M49PhysicalSafetyPlaybackError("physical-safety playback policy changed")
+    return {
+        "chunk_frame_count": 32,
+        "startup_prebuffer_chunk_count": 2,
+        "resident_chunk_count_max": 3,
+        "forward_prefetch_chunk_count": 1,
+    }
+
+
+def _chunk_payload(
+    path: Path,
+    *,
+    start: int,
+    states: np.ndarray,
+    z_bounds: np.ndarray,
+) -> None:
+    frame_count, cell_count = states.shape
+    state_values = np.ascontiguousarray(states, dtype=np.uint8)
+    z_values = np.ascontiguousarray(z_bounds, dtype="<f4")
+    state_bytes = state_values.nbytes
+    z_bytes = z_values.nbytes
+    padding = (4 - ((CHUNK_HEADER.size + state_bytes) % 4)) % 4
+    with path.open("wb") as stream:
+        stream.write(
+            CHUNK_HEADER.pack(
+                CHUNK_MAGIC,
+                start,
+                frame_count,
+                cell_count,
+                state_bytes,
+                z_bytes,
+            )
+        )
+        stream.write(memoryview(state_values).cast("B"))
+        if padding:
+            stream.write(b"\0" * padding)
+        stream.write(memoryview(z_values).cast("B"))
+
+
+def seal_m49_physical_safety_playback(
+    *,
+    source_root: Path,
+    destination_root: Path,
+    profile_path: Path,
+    created_at_utc: str | None = None,
+) -> M49PhysicalSafetyPlayback:
+    """Sequentially seal local tracks without starting or contacting Worker 006."""
+
+    raw_source = source_root.expanduser().absolute()
+    if raw_source.is_symlink() or not raw_source.is_dir():
+        raise M49PhysicalSafetyPlaybackError("sealed source root is unavailable")
+    source = raw_source.resolve(strict=True)
+    destination = destination_root.expanduser().absolute()
+    destination.mkdir(parents=True, exist_ok=True)
+    if destination.is_symlink():
+        raise M49PhysicalSafetyPlaybackError("destination must not be a symlink")
+    raw_profile = profile_path.expanduser().absolute()
+    if raw_profile.is_symlink() or not raw_profile.is_file():
+        raise M49PhysicalSafetyPlaybackError("physical-safety profile is unavailable")
+    profile_file = raw_profile.resolve(strict=True)
+
+    source_manifest = _json(source / "manifest.json", "source manifest")
+    source_report = _json(source / "report.json", "source report")
+    source_result_id = source_manifest.get("result_id")
+    source_identity = source_manifest.get("identity")
+    source_identity_sha256 = source_manifest.get("identity_sha256")
+    if (
+        not isinstance(source_result_id, str)
+        or source_report.get("result_id") != source_result_id
+        or not isinstance(source_identity, dict)
+        or not isinstance(source_identity_sha256, str)
+        or source_identity_sha256 != _canonical_sha256(source_identity)
+        or not source_result_id.endswith(source_identity_sha256)
+    ):
+        raise M49PhysicalSafetyPlaybackError("source result identity changed")
+    source_artifacts = _source_artifacts(source, source_manifest)
+    state_codes = _state_codes(source_report)
+    cell_size_m, radius_m, coordinate_frame = _source_geometry(source_report)
+    profile = _json(profile_file, "physical-safety profile")
+    policy = _profile_policy(profile, cell_size_m)
+    profile_sha256 = _sha256(profile_file)
+    source_manifest_sha256 = _sha256(source / "manifest.json")
+
+    try:
+        centers = np.load(
+            source / "costmap-cell-centers-xy-m.npy", mmap_mode="r", allow_pickle=False
+        )
+        states = np.load(source / "costmap-states.npy", mmap_mode="r", allow_pickle=False)
+        z_bounds = np.load(
+            source / "costmap-z-bounds-m.npy", mmap_mode="r", allow_pickle=False
+        )
+    except (OSError, ValueError) as error:
+        raise M49PhysicalSafetyPlaybackError("source numeric tracks are invalid") from error
+    frames = _frame_rows(source / "frames.ndjson")
+    if (
+        centers.dtype != np.dtype("<f4")
+        or states.dtype != np.dtype("uint8")
+        or z_bounds.dtype != np.dtype("<f4")
+        or centers.ndim != 2
+        or centers.shape[1] != 2
+        or states.ndim != 2
+        or z_bounds.ndim != 3
+        or z_bounds.shape[2] != 2
+        or states.shape[0] != len(frames)
+        or states.shape[1] != centers.shape[0]
+        or z_bounds.shape != (states.shape[0], states.shape[1], 2)
+        or not np.isfinite(centers).all()
+    ):
+        raise M49PhysicalSafetyPlaybackError("source numeric shape or dtype changed")
+    frame_count, cell_count = states.shape
+    admitted_codes = np.asarray(sorted(set(state_codes.values())), dtype=np.uint8)
+
+    identity = {
+        "schema_version": SCHEMA,
+        "source_result_id": source_result_id,
+        "source_manifest_sha256": source_manifest_sha256,
+        "source_track_sha256": {
+            name: source_artifacts[name]["sha256"] for name in SOURCE_TRACKS
+        },
+        "profile_id": profile.get("profile_id"),
+        "profile_sha256": profile_sha256,
+        "coordinate_frame": coordinate_frame,
+        "frame_count": frame_count,
+        "cell_count": cell_count,
+        "cell_size_m": cell_size_m,
+        "radius_m": radius_m,
+        "state_codes": state_codes,
+        "playback_policy": policy,
+        "authority": {
+            "commands_enabled": False,
+            "navigation_or_safety_accepted": False,
+            "actuation_accepted": False,
+        },
+    }
+    identity_sha256 = _canonical_sha256(identity)
+    result_id = f"{PREFIX}{identity_sha256}"
+    target = destination / result_id
+    if target.exists():
+        existing = read_m49_physical_safety_playback(target)
+        existing_playback = existing.manifest["playback"]
+        assert isinstance(existing_playback, dict)
+        existing_chunks = existing_playback["chunks"]
+        assert isinstance(existing_chunks, list)
+        for value in (
+            existing_playback["centers"],
+            existing_playback["frames"],
+            *existing_chunks,
+        ):
+            assert isinstance(value, dict)
+            verify_m49_physical_safety_artifact(existing, value)
+        return existing
+
+    created = created_at_utc or datetime.now(tz=UTC).isoformat().replace("+00:00", "Z")
+    chunk_frame_count = int(policy["chunk_frame_count"])
+    with tempfile.TemporaryDirectory(
+        prefix="mission-core-m49-physical-safety-", dir=destination
+    ) as raw_staging:
+        staging = Path(raw_staging) / result_id
+        staging.mkdir()
+        centers_path = staging / "centers.f32"
+        np.ascontiguousarray(centers, dtype="<f4").tofile(centers_path)
+        frames_path = staging / "frames.ndjson"
+        shutil.copyfile(source / "frames.ndjson", frames_path)
+        centers_artifact = _artifact(
+            centers_path,
+            media_type="application/octet-stream",
+            role="costmap-cell-centers-f32le",
+        )
+        frames_artifact = _artifact(
+            frames_path,
+            media_type="application/x-ndjson",
+            role="frame-catalog",
+        )
+        chunks: list[dict[str, object]] = []
+        for index, start in enumerate(range(0, frame_count, chunk_frame_count)):
+            count = min(chunk_frame_count, frame_count - start)
+            state_slice = states[start : start + count]
+            if not np.isin(state_slice, admitted_codes).all():
+                raise M49PhysicalSafetyPlaybackError(
+                    f"source state code changed in chunk {index}"
+                )
+            for local_index, frame in enumerate(frames[start : start + count]):
+                if frame["sample_available"] is False and (
+                    np.any(state_slice[local_index] != 0)
+                    or np.isfinite(z_bounds[start + local_index]).any()
+                ):
+                    raise M49PhysicalSafetyPlaybackError(
+                        "missing source sample did not remain fail-closed"
+                    )
+            chunk_path = staging / f"chunk-{index:06d}.bin"
+            _chunk_payload(
+                chunk_path,
+                start=start,
+                states=state_slice,
+                z_bounds=z_bounds[start : start + count],
+            )
+            descriptor = _artifact(
+                chunk_path,
+                media_type="application/octet-stream",
+                role="states-u8-and-z-bounds-f32le",
+            )
+            descriptor.update(
+                {
+                    "index": index,
+                    "start": start,
+                    "count": count,
+                    "header_bytes": CHUNK_HEADER.size,
+                    "format": "mcpsch01-states-u8-aligned-z-bounds-f32le",
+                }
+            )
+            chunks.append(descriptor)
+
+        manifest = {
+            "schema_version": SCHEMA,
+            "result_id": result_id,
+            "created_at_utc": created,
+            "identity_sha256": identity_sha256,
+            "identity": identity,
+            "execution": {
+                "execution_class": "local-sequential-offline",
+                "worker_role": "realtime-only",
+                "worker_runtime_dependency": False,
+                "worker_requests_required": 0,
+            },
+            "playback": {
+                "coordinate_frame": coordinate_frame,
+                "source_pace_hz": profile["operator_visual"]["source_pace_hz"],
+                "frame_count": frame_count,
+                "cell_count": cell_count,
+                "cell_size_m": cell_size_m,
+                "radius_m": radius_m,
+                "state_codes": state_codes,
+                **policy,
+                "centers": {
+                    **centers_artifact,
+                    "dtype": "<f4",
+                    "shape": [cell_count, 2],
+                },
+                "frames": {
+                    **frames_artifact,
+                    "dtype": "ndjson",
+                    "shape": [frame_count],
+                },
+                "chunks": chunks,
+            },
+            "authority": identity["authority"],
+        }
+        (staging / "manifest.json").write_text(
+            json.dumps(manifest, indent=2, sort_keys=True, allow_nan=False) + "\n",
+            encoding="utf-8",
+        )
+        staging.replace(target)
+    return read_m49_physical_safety_playback(target)
+
+
+def read_m49_physical_safety_playback(root: Path) -> M49PhysicalSafetyPlayback:
+    raw_candidate = root.expanduser().absolute()
+    if raw_candidate.is_symlink() or not raw_candidate.is_dir():
+        raise M49PhysicalSafetyPlaybackError("physical-safety playback root is invalid")
+    candidate = raw_candidate.resolve(strict=True)
+    manifest = _json(candidate / "manifest.json", "physical-safety playback manifest")
+    identity = manifest.get("identity")
+    execution = manifest.get("execution")
+    if (
+        manifest.get("schema_version") != SCHEMA
+        or not isinstance(identity, dict)
+        or not isinstance(execution, dict)
+        or manifest.get("identity_sha256") != _canonical_sha256(identity)
+        or manifest.get("result_id") != candidate.name
+        or candidate.name != f"{PREFIX}{manifest.get('identity_sha256')}"
+        or execution.get("worker_requests_required") != 0
+        or execution.get("worker_runtime_dependency") is not False
+    ):
+        raise M49PhysicalSafetyPlaybackError("physical-safety playback identity changed")
+    playback = manifest.get("playback")
+    if not isinstance(playback, dict) or not isinstance(playback.get("chunks"), list):
+        raise M49PhysicalSafetyPlaybackError("physical-safety playback catalog changed")
+    descriptors = [playback.get("centers"), playback.get("frames"), *playback["chunks"]]
+    seen: set[str] = set()
+    for descriptor in descriptors:
+        if not isinstance(descriptor, dict) or not isinstance(descriptor.get("path"), str):
+            raise M49PhysicalSafetyPlaybackError("physical-safety artifact entry changed")
+        name = descriptor["path"]
+        path = candidate / name
+        if (
+            name in seen
+            or path.parent != candidate
+            or path.is_symlink()
+            or not path.is_file()
+            or descriptor.get("byte_length") != path.stat().st_size
+            or not isinstance(descriptor.get("sha256"), str)
+            or len(descriptor["sha256"]) != 64
+            or any(character not in "0123456789abcdef" for character in descriptor["sha256"])
+        ):
+            raise M49PhysicalSafetyPlaybackError("physical-safety artifact changed")
+        seen.add(name)
+    return M49PhysicalSafetyPlayback(candidate.name, candidate, manifest)
+
+
+def verify_m49_physical_safety_artifact(
+    result: M49PhysicalSafetyPlayback,
+    descriptor: dict[str, Any],
+) -> Path:
+    name = descriptor.get("path")
+    if not isinstance(name, str):
+        raise M49PhysicalSafetyPlaybackError("physical-safety artifact path changed")
+    path = result.root / name
+    if (
+        path.parent != result.root
+        or path.is_symlink()
+        or not path.is_file()
+        or descriptor.get("byte_length") != path.stat().st_size
+        or descriptor.get("sha256") != _sha256(path)
+    ):
+        raise M49PhysicalSafetyPlaybackError("physical-safety artifact digest changed")
+    return path
+
+
+__all__ = [
+    "CHUNK_HEADER",
+    "CHUNK_MAGIC",
+    "M49PhysicalSafetyPlayback",
+    "M49PhysicalSafetyPlaybackError",
+    "PREFIX",
+    "SCHEMA",
+    "read_m49_physical_safety_playback",
+    "seal_m49_physical_safety_playback",
+    "verify_m49_physical_safety_artifact",
+]
diff --git a/src/k1link/perception/threat_replay.py b/src/k1link/perception/threat_replay.py
index 71b225f..4f57a7e 100644
--- a/src/k1link/perception/threat_replay.py
+++ b/src/k1link/perception/threat_replay.py
@@ -452,6 +452,32 @@ def build_threat_replay(
 
 
 def read_threat_replay_result(root: Path) -> ThreatReplayResult:
+    """Read and deeply verify a sealed threat replay result.
+
+    This is the acceptance/build seam.  It deliberately walks every ledger row
+    before returning and therefore must not sit on the synchronous LAB open
+    path for a hundreds-of-megabytes recorded result.
+    """
+
+    return _read_threat_replay_result(root, validate_ledgers=True)
+
+
+def read_threat_replay_result_metadata(root: Path) -> ThreatReplayResult:
+    """Read verified result metadata without eagerly parsing the full ledger.
+
+    Artifact bytes are still digest checked against the sealed manifest.  The
+    bounded timeline reader validates every requested row before projection;
+    only the redundant all-4489-row JSON accounting pass is deferred.
+    """
+
+    return _read_threat_replay_result(root, validate_ledgers=False)
+
+
+def _read_threat_replay_result(
+    root: Path,
+    *,
+    validate_ledgers: bool,
+) -> ThreatReplayResult:
     resolved = root.resolve(strict=True)
     if resolved.is_symlink() or not resolved.name.startswith(THREAT_REPLAY_RESULT_PREFIX):
         raise ThreatReplayError("threat replay result root is invalid")
@@ -498,7 +524,8 @@ def read_threat_replay_result(root: Path) -> ThreatReplayResult:
     for role, (name, identity_key) in expected.items():
         path = _validated_artifact(resolved, by_role[role], name)
         paths[role] = path
-        if identity_key is not None and _file_sha256(path) != identity.get(identity_key):
+        artifact = _object(by_role[role], "threat artifact")
+        if identity_key is not None and artifact.get("sha256") != identity.get(identity_key):
             raise ThreatReplayError("threat artifact identity changed")
     report = _read_json(paths["threat-replay-report"])
     metrics = _object(identity.get("metrics"), "threat metrics")
@@ -522,12 +549,13 @@ def read_threat_replay_result(root: Path) -> ThreatReplayResult:
         or requirements != expected_requirements
     ):
         raise ThreatReplayError("threat replay report or acceptance changed")
-    _validate_ledgers(
-        paths["threat-replay-frames"],
-        paths["threat-visual-frames"],
-        metrics,
-        is_v2=is_v2,
-    )
+    if validate_ledgers:
+        _validate_ledgers(
+            paths["threat-replay-frames"],
+            paths["threat-visual-frames"],
+            metrics,
+            is_v2=is_v2,
+        )
     return ThreatReplayResult(
         result_id=resolved.name,
         result_root=resolved,
diff --git a/src/k1link/perception/threat_timeline.py b/src/k1link/perception/threat_timeline.py
index 4cae20d..c078cb3 100644
--- a/src/k1link/perception/threat_timeline.py
+++ b/src/k1link/perception/threat_timeline.py
@@ -13,6 +13,8 @@ from pathlib import Path
 from threading import RLock
 from typing import Final
 
+import numpy as np
+
 from .geometry import RecordedGeometryStore
 from .recorded_source import RECORDED_REPRESENTATION_ID
 from .spatial_evidence import (
@@ -78,24 +80,56 @@ class RecordedThreatTimeline:
         }
         if any(identity.get(key) != value for key, value in expected_identity.items()):
             raise RecordedThreatTimelineError("recorded timeline escaped the threat profile")
-        self.store = RecordedGeometryStore.from_repository(self.repository_root)
-        if (
-            self.store.profile.source_pack_id != self.profile.source_pack_id
-            or self.store.profile.source_pack_sha256 != self.profile.source_pack_sha256
-            or self.store.profile.frame_count != _EXPECTED_FRAME_COUNT
-        ):
-            raise RecordedThreatTimelineError("recorded timeline geometry identity changed")
-        if self.store.maximum_current_point_count > RECORDED_SPATIAL_POINT_LIMIT:
-            raise RecordedThreatTimelineError(
-                "recorded timeline exact point delivery exceeds its declared bound"
-            )
-        self.body_frames = RecordedReplayBodyFrameResolver(
-            self.store,
-            profile=self.profile.body_frame,
+        self._maximum_source_points_per_frame = _read_source_point_bound(
+            self.repository_root,
+            source_pack_id=self.profile.source_pack_id,
+            source_pack_sha256=self.profile.source_pack_sha256,
         )
+        self._store: RecordedGeometryStore | None = None
+        self._body_frames: RecordedReplayBodyFrameResolver | None = None
         self.index = _index_frame_ledger(self.frames_path)
         self._lock = RLock()
 
+    @property
+    def store(self) -> RecordedGeometryStore:
+        """Load and deeply verify the large geometry archives on first use.
+
+        Timeline metadata, camera playback and the independent TGS artifact can
+        become visible without waiting for the source cloud archive.  Any
+        endpoint that actually delivers source points still crosses the full
+        digest and shape validation in ``RecordedGeometryStore``.
+        """
+
+        with self._lock:
+            if self._store is None:
+                store = RecordedGeometryStore.from_repository(self.repository_root)
+                if (
+                    store.profile.source_pack_id != self.profile.source_pack_id
+                    or store.profile.source_pack_sha256 != self.profile.source_pack_sha256
+                    or store.profile.frame_count != _EXPECTED_FRAME_COUNT
+                    or store.maximum_current_point_count
+                    != self._maximum_source_points_per_frame
+                ):
+                    raise RecordedThreatTimelineError(
+                        "recorded timeline geometry identity changed"
+                    )
+                if store.maximum_current_point_count > RECORDED_SPATIAL_POINT_LIMIT:
+                    raise RecordedThreatTimelineError(
+                        "recorded timeline exact point delivery exceeds its declared bound"
+                    )
+                self._store = store
+            return self._store
+
+    @property
+    def body_frames(self) -> RecordedReplayBodyFrameResolver:
+        with self._lock:
+            if self._body_frames is None:
+                self._body_frames = RecordedReplayBodyFrameResolver(
+                    self.store,
+                    profile=self.profile.body_frame,
+                )
+            return self._body_frames
+
     def metadata(self) -> dict[str, object]:
         times = self.index.source_times_ns
         intervals = [(current - previous) / 1_000_000_000 for previous, current in pairwise(times)]
@@ -120,7 +154,7 @@ class RecordedThreatTimeline:
             "max_chunk_frames": RECORDED_SPATIAL_MAX_CHUNK_FRAMES,
             "point_sample_limit": RECORDED_SPATIAL_POINT_LIMIT,
             "point_delivery": "exact-current-increment",
-            "maximum_source_points_per_frame": self.store.maximum_current_point_count,
+            "maximum_source_points_per_frame": self._maximum_source_points_per_frame,
             "local_surface_visualization": {
                 "derivation": "bounded-registered-increment-accumulation",
                 "window_seconds": RECORDED_LOCAL_SURFACE_WINDOW_SECONDS,
@@ -258,6 +292,82 @@ class RecordedThreatTimeline:
         }
 
 
+def _read_source_point_bound(
+    repository_root: Path,
+    *,
+    source_pack_id: str,
+    source_pack_sha256: str,
+) -> int:
+    """Read the small offsets member without inflating the 70 MiB source pack.
+
+    This is metadata only.  The exact archive digest, every array shape and the
+    local-surface binding are still verified lazily by ``RecordedGeometryStore``
+    before any source point is delivered.
+    """
+
+    base = (
+        repository_root / ".runtime/compute-experiments/e10/lidar-packs"
+    ).resolve(strict=True)
+    pack_root = (base / source_pack_id).resolve(strict=True)
+    manifest_path = (pack_root / "manifest.json").resolve(strict=True)
+    pack_path = (pack_root / "lidar-pack.npz").resolve(strict=True)
+    if (
+        pack_root.parent != base
+        or pack_root.is_symlink()
+        or manifest_path.parent != pack_root
+        or manifest_path.is_symlink()
+        or pack_path.parent != pack_root
+        or pack_path.is_symlink()
+        or not pack_path.is_file()
+    ):
+        raise RecordedThreatTimelineError("recorded timeline source pack path changed")
+    try:
+        manifest = json.loads(manifest_path.read_text(encoding="utf-8"))
+        if not isinstance(manifest, dict):
+            raise RecordedThreatTimelineError(
+                "recorded timeline source pack manifest is invalid"
+            )
+        identity = manifest.get("identity")
+        artifact = manifest.get("artifact")
+        if not isinstance(identity, dict) or not isinstance(artifact, dict):
+            raise RecordedThreatTimelineError(
+                "recorded timeline source pack manifest is invalid"
+            )
+        point_count = identity.get("point_count")
+        if (
+            manifest.get("pack_id") != source_pack_id
+            or identity.get("frame_count") != _EXPECTED_FRAME_COUNT
+            or not isinstance(point_count, int)
+            or isinstance(point_count, bool)
+            or point_count < 0
+            or artifact.get("path") != "lidar-pack.npz"
+            or artifact.get("sha256") != source_pack_sha256
+            or artifact.get("byte_length") != pack_path.stat().st_size
+        ):
+            raise RecordedThreatTimelineError(
+                "recorded timeline source pack identity changed"
+            )
+        with np.load(pack_path, allow_pickle=False) as archive:
+            offsets = np.asarray(archive["cloud_offsets"], dtype=np.int64)
+    except (KeyError, OSError, ValueError, json.JSONDecodeError) as error:
+        raise RecordedThreatTimelineError(
+            "recorded timeline source point offsets are unavailable"
+        ) from error
+    if (
+        offsets.shape != (_EXPECTED_FRAME_COUNT + 1,)
+        or int(offsets[0]) != 0
+        or int(offsets[-1]) != point_count
+        or np.any(np.diff(offsets) < 0)
+    ):
+        raise RecordedThreatTimelineError("recorded timeline source point offsets changed")
+    maximum = int(np.diff(offsets).max(initial=0))
+    if maximum > RECORDED_SPATIAL_POINT_LIMIT:
+        raise RecordedThreatTimelineError(
+            "recorded timeline exact point delivery exceeds its declared bound"
+        )
+    return maximum
+
+
 def _index_frame_ledger(path: Path) -> RecordedThreatTimelineIndex:
     offsets: list[int] = []
     source_times: list[int] = []
diff --git a/src/k1link/web/app.py b/src/k1link/web/app.py
index a81bd86..a97155a 100644
--- a/src/k1link/web/app.py
+++ b/src/k1link/web/app.py
@@ -133,6 +133,9 @@ from k1link.web.m48s_fixed_class_detector_lab_api import (
     build_m48s_fixed_class_detector_lab_router,
 )
 from k1link.web.m48t_risk_quality_lab_api import build_m48t_risk_quality_lab_router
+from k1link.web.m49_physical_safety_playback_api import (
+    build_m49_physical_safety_playback_router,
+)
 from k1link.web.m49_tgs_fail_closed_api import build_m49_tgs_fail_closed_router
 from k1link.web.m49_tgs_full_shadow_api import build_m49_tgs_full_shadow_router
 from k1link.web.map_api import (
@@ -1016,6 +1019,17 @@ app.include_router(
         ),
     )
 )
+app.include_router(
+    build_m49_physical_safety_playback_router(
+        root_provider=lambda: (
+            REPOSITORY_ROOT
+            / ".runtime"
+            / "compute-experiments"
+            / "m49"
+            / "physical-safety-playback-results"
+        ),
+    )
+)
 app.include_router(
     build_m48s_fixed_class_detector_lab_router(
         root_provider=lambda: (
diff --git a/src/k1link/web/m49_physical_safety_playback_api.py b/src/k1link/web/m49_physical_safety_playback_api.py
new file mode 100644
index 0000000..3ac0483
--- /dev/null
+++ b/src/k1link/web/m49_physical_safety_playback_api.py
@@ -0,0 +1,221 @@
+"""Read-only local API for autonomous M49 physical-safety playback artifacts."""
+
+from __future__ import annotations
+
+import copy
+import re
+from collections.abc import Callable
+from functools import lru_cache
+from pathlib import Path
+from typing import Any, Final
+
+from fastapi import APIRouter, HTTPException, Query
+from fastapi.responses import FileResponse
+
+from k1link.laboratory.m49_physical_safety_playback import (
+    PREFIX,
+    M49PhysicalSafetyPlayback,
+    M49PhysicalSafetyPlaybackError,
+    read_m49_physical_safety_playback,
+    verify_m49_physical_safety_artifact,
+)
+
+RootProvider = Callable[[], Path | None]
+RESULT_ID: Final = re.compile(rf"^{re.escape(PREFIX)}[a-f0-9]{{64}}$")
+SOURCE_RESULT_ID: Final = re.compile(r"^m49-tgs-full-shadow-[a-f0-9]{64}$")
+ENDPOINT_ROOT: Final = "/api/v1/laboratory/m49/physical-safety-playback"
+
+
+def build_m49_physical_safety_playback_router(
+    *, root_provider: RootProvider = lambda: None
+) -> APIRouter:
+    router = APIRouter(prefix=ENDPOINT_ROOT, tags=["laboratory"])
+
+    def sealed(result_id: str) -> M49PhysicalSafetyPlayback:
+        root = _configured_root(root_provider)
+        if root is None or RESULT_ID.fullmatch(result_id) is None:
+            raise HTTPException(status_code=404, detail="M49 physical-safety playback not found")
+        candidate = root / result_id
+        if candidate.is_symlink() or not candidate.is_dir():
+            raise HTTPException(status_code=404, detail="M49 physical-safety playback not found")
+        try:
+            resolved = candidate.resolve(strict=True)
+            if resolved.parent != root:
+                raise ValueError("result escaped configured root")
+            return _read_cached(str(resolved), _signature(resolved))
+        except (M49PhysicalSafetyPlaybackError, OSError, ValueError):
+            raise HTTPException(
+                status_code=404, detail="M49 physical-safety playback not found"
+            ) from None
+
+    @router.get("/results")
+    def list_results(
+        limit: int = Query(default=10, ge=1, le=25),
+        source_result_id: str | None = Query(default=None),
+    ) -> dict[str, object]:
+        if source_result_id is not None and SOURCE_RESULT_ID.fullmatch(source_result_id) is None:
+            raise HTTPException(status_code=422, detail="M49 source result identity is invalid")
+        root = _configured_root(root_provider)
+        if root is None:
+            return _catalog([], configured=False, invalid_total=0)
+        items: list[dict[str, object]] = []
+        invalid = 0
+        for candidate in sorted(root.iterdir()):
+            if candidate.is_symlink() or not candidate.is_dir() or not RESULT_ID.fullmatch(
+                candidate.name
+            ):
+                continue
+            try:
+                summary = _summary(
+                    _read_cached(str(candidate.resolve()), _signature(candidate))
+                )
+                if source_result_id is None or summary["source_result_id"] == source_result_id:
+                    items.append(summary)
+            except (M49PhysicalSafetyPlaybackError, OSError, ValueError):
+                invalid += 1
+        items.sort(
+            key=lambda value: (str(value["created_at_utc"]), str(value["result_id"])),
+            reverse=True,
+        )
+        return _catalog(items[:limit], configured=True, invalid_total=invalid)
+
+    @router.get("/{result_id}/manifest")
+    def get_manifest(result_id: str) -> dict[str, object]:
+        return _project_manifest(sealed(result_id))
+
+    @router.get("/{result_id}/tracks/{track_id}")
+    def get_track(result_id: str, track_id: str) -> FileResponse:
+        result = sealed(result_id)
+        playback = _playback(result)
+        if track_id == "centers":
+            descriptor = _descriptor(playback.get("centers"), "centers")
+        elif track_id == "frames":
+            descriptor = _descriptor(playback.get("frames"), "frames")
+        else:
+            raise HTTPException(status_code=404, detail="M49 physical-safety track not found")
+        return _file_response(result, descriptor)
+
+    @router.get("/{result_id}/chunks/{chunk_index}")
+    def get_chunk(result_id: str, chunk_index: int) -> FileResponse:
+        result = sealed(result_id)
+        chunks = _playback(result).get("chunks")
+        if not isinstance(chunks, list) or chunk_index < 0 or chunk_index >= len(chunks):
+            raise HTTPException(status_code=404, detail="M49 physical-safety chunk not found")
+        descriptor = _descriptor(chunks[chunk_index], f"chunk {chunk_index}")
+        if descriptor.get("index") != chunk_index:
+            raise HTTPException(status_code=503, detail="M49 physical-safety chunk catalog changed")
+        return _file_response(result, descriptor)
+
+    return router
+
+
+@lru_cache(maxsize=8)
+def _read_cached(root: str, signature: tuple[int, ...]) -> M49PhysicalSafetyPlayback:
+    del signature
+    return read_m49_physical_safety_playback(Path(root))
+
+
+def _file_response(
+    result: M49PhysicalSafetyPlayback,
+    descriptor: dict[str, Any],
+) -> FileResponse:
+    try:
+        path = verify_m49_physical_safety_artifact(result, descriptor)
+    except (KeyError, OSError, TypeError, ValueError, M49PhysicalSafetyPlaybackError):
+        raise HTTPException(
+            status_code=503,
+            detail="M49 physical-safety playback artifact failed verification",
+        ) from None
+    return FileResponse(
+        path,
+        media_type=str(descriptor.get("media_type") or "application/octet-stream"),
+        headers={
+            "Cache-Control": "private, max-age=31536000, immutable",
+            "Content-Encoding": "identity",
+            "ETag": f'"{descriptor["sha256"]}"',
+            "X-Content-Type-Options": "nosniff",
+            "X-Mission-Core-Worker-Dependency": "none",
+        },
+    )
+
+
+def _playback(result: M49PhysicalSafetyPlayback) -> dict[str, Any]:
+    playback = result.manifest.get("playback")
+    if not isinstance(playback, dict):
+        raise HTTPException(status_code=503, detail="M49 physical-safety playback changed")
+    return playback
+
+
+def _descriptor(value: object, label: str) -> dict[str, Any]:
+    if not isinstance(value, dict):
+        raise HTTPException(status_code=503, detail=f"M49 physical-safety {label} changed")
+    return value
+
+
+def _project_manifest(result: M49PhysicalSafetyPlayback) -> dict[str, object]:
+    payload = copy.deepcopy(result.manifest)
+    playback = payload["playback"]
+    assert isinstance(playback, dict)
+    centers = playback["centers"]
+    frames = playback["frames"]
+    chunks = playback["chunks"]
+    assert isinstance(centers, dict) and isinstance(frames, dict) and isinstance(chunks, list)
+    centers["url"] = f"{ENDPOINT_ROOT}/{result.result_id}/tracks/centers"
+    frames["url"] = f"{ENDPOINT_ROOT}/{result.result_id}/tracks/frames"
+    for index, value in enumerate(chunks):
+        assert isinstance(value, dict)
+        value["url"] = f"{ENDPOINT_ROOT}/{result.result_id}/chunks/{index}"
+    payload["access"] = "read-only-sealed-local"
+    return payload
+
+
+def _summary(result: M49PhysicalSafetyPlayback) -> dict[str, object]:
+    playback = _playback(result)
+    return {
+        "schema_version": "missioncore.m49-physical-safety-playback-summary/v1",
+        "result_id": result.result_id,
+        "created_at_utc": result.manifest.get("created_at_utc"),
+        "source_result_id": result.manifest["identity"]["source_result_id"],
+        "frame_count": playback.get("frame_count"),
+        "cell_count": playback.get("cell_count"),
+        "cell_size_m": playback.get("cell_size_m"),
+        "radius_m": playback.get("radius_m"),
+        "chunk_count": len(playback.get("chunks", [])),
+        "worker_runtime_dependency": False,
+        "navigation_or_safety_accepted": False,
+    }
+
+
+def _catalog(
+    items: list[dict[str, object]], *, configured: bool, invalid_total: int
+) -> dict[str, object]:
+    return {
+        "schema_version": "missioncore.m49-physical-safety-playback-catalog/v1",
+        "configured": configured,
+        "items": items,
+        "candidate_total": len(items) + invalid_total,
+        "invalid_total": invalid_total,
+        "worker_runtime_dependency": False,
+        "access": "read-only-sealed-local",
+    }
+
+
+def _configured_root(provider: RootProvider) -> Path | None:
+    value = provider()
+    if value is None:
+        return None
+    raw = value.expanduser().absolute()
+    if raw.is_symlink() or not raw.is_dir():
+        return None
+    return raw.resolve(strict=True)
+
+
+def _signature(root: Path) -> tuple[int, ...]:
+    path = root / "manifest.json"
+    if path.is_symlink() or not path.is_file():
+        raise ValueError("physical-safety manifest unavailable")
+    stat = path.stat()
+    return (stat.st_size, stat.st_mtime_ns)
+
+
+__all__ = ["build_m49_physical_safety_playback_router"]
diff --git a/src/k1link/web/m4_threat_replay_api.py b/src/k1link/web/m4_threat_replay_api.py
index b6fa8e5..2411e7a 100644
--- a/src/k1link/web/m4_threat_replay_api.py
+++ b/src/k1link/web/m4_threat_replay_api.py
@@ -22,7 +22,7 @@ from k1link.perception.threat_replay import (
     THREAT_REPLAY_VISUAL_SCHEMA_V2,
     ThreatReplayError,
     ThreatReplayResult,
-    read_threat_replay_result,
+    read_threat_replay_result_metadata,
 )
 from k1link.perception.threat_timeline import (
     RECORDED_SPATIAL_MAX_CHUNK_FRAMES,
@@ -34,6 +34,7 @@ from k1link.sessions import RecordedCameraFrame, SessionIntegrityError
 M4_THREAT_CATALOG_SCHEMA: Final = "missioncore.m4-threat-replay-catalog/v1"
 M4_THREAT_VIEW_SCHEMA: Final = "missioncore.m4-threat-replay-view/v1"
 M4_THREAT_VISUAL_CATALOG_SCHEMA: Final = "missioncore.m4-threat-visual-catalog/v1"
+M4_THREAT_PLAYBACK_CHUNK_FRAMES: Final = 24
 _RESULT_ID = re.compile(rf"^{THREAT_REPLAY_RESULT_PREFIX}[a-f0-9]{{64}}$")
 RootProvider = Callable[[], Path | None]
 CameraFrameProvider = Callable[[str, int], RecordedCameraFrame]
@@ -212,13 +213,19 @@ def build_m4_threat_replay_router(
         projected = timeline(result_id)
         points = projected.store.playback_points_map()
         offsets = projected.store.playback_point_offsets()
-        content_sha256 = hashlib.sha256(memoryview(points).cast("B")).hexdigest()
+        points_view = memoryview(points).cast("B")
+        content_sha256 = hashlib.sha256(points_view).hexdigest()
+        chunks = _playback_chunk_catalog(result_id, points_view, offsets)
         return {
             "schema_version": "missioncore.recorded-spatial-playback/v1",
             "result_id": result_id,
             "frame_count": len(offsets) - 1,
             "point_count": int(points.shape[0]),
             "point_offsets": list(offsets),
+            "chunk_frame_count": M4_THREAT_PLAYBACK_CHUNK_FRAMES,
+            "resident_chunk_count_max": 4,
+            "forward_prefetch_chunk_count": 1,
+            "chunks": chunks,
             "track": {
                 "id": "points-map-f32",
                 "url": (
@@ -238,6 +245,42 @@ def build_m4_threat_replay_router(
             "access": "read-only-sealed-binary-playback",
         }
 
+    @router.get(
+        "/results/{result_id}/timeline/playback/chunks/{chunk_index}",
+        response_class=Response,
+    )
+    def get_timeline_playback_chunk(result_id: str, chunk_index: int) -> Response:
+        projected = timeline(result_id)
+        points = projected.store.playback_points_map()
+        offsets = projected.store.playback_point_offsets()
+        points_view = memoryview(points).cast("B")
+        descriptor = _playback_chunk_descriptor(
+            result_id,
+            points_view,
+            offsets,
+            chunk_index,
+        )
+        if descriptor is None:
+            raise HTTPException(status_code=404, detail="M4.6 playback chunk не найден")
+        point_start = descriptor["point_start"]
+        byte_length = descriptor["bytes"]
+        assert isinstance(point_start, int)
+        assert isinstance(byte_length, int)
+        byte_start = point_start * 3 * 4
+        byte_stop = byte_start + byte_length
+        return Response(
+            content=bytes(points_view[byte_start:byte_stop]),
+            media_type="application/octet-stream",
+            headers={
+                "Cache-Control": "private, max-age=31536000, immutable",
+                "Content-Encoding": "identity",
+                "Content-Length": str(byte_length),
+                "ETag": f'"{descriptor["sha256"]}"',
+                "X-Content-Type-Options": "nosniff",
+                "X-Uncompressed-Content-Length": str(byte_length),
+            },
+        )
+
     @router.get(
         "/results/{result_id}/timeline/playback/tracks/points-map-f32",
         response_class=StreamingResponse,
@@ -276,13 +319,71 @@ def _binary_chunks(view: memoryview, chunk_size: int = 1024 * 1024) -> Iterator[
         yield bytes(view[start : start + chunk_size])
 
 
+def _playback_chunk_catalog(
+    result_id: str,
+    points_view: memoryview,
+    offsets: tuple[int, ...],
+) -> list[dict[str, object]]:
+    frame_count = len(offsets) - 1
+    chunk_count = (
+        frame_count + M4_THREAT_PLAYBACK_CHUNK_FRAMES - 1
+    ) // M4_THREAT_PLAYBACK_CHUNK_FRAMES
+    return [
+        descriptor
+        for chunk_index in range(chunk_count)
+        if (
+            descriptor := _playback_chunk_descriptor(
+                result_id,
+                points_view,
+                offsets,
+                chunk_index,
+            )
+        )
+        is not None
+    ]
+
+
+def _playback_chunk_descriptor(
+    result_id: str,
+    points_view: memoryview,
+    offsets: tuple[int, ...],
+    chunk_index: int,
+) -> dict[str, object] | None:
+    frame_count = len(offsets) - 1
+    start = chunk_index * M4_THREAT_PLAYBACK_CHUNK_FRAMES
+    if chunk_index < 0 or start >= frame_count:
+        return None
+    count = min(M4_THREAT_PLAYBACK_CHUNK_FRAMES, frame_count - start)
+    point_start = offsets[start]
+    point_stop = offsets[start + count]
+    byte_start = point_start * 3 * 4
+    byte_stop = point_stop * 3 * 4
+    payload = points_view[byte_start:byte_stop]
+    return {
+        "index": chunk_index,
+        "start": start,
+        "count": count,
+        "point_start": point_start,
+        "point_count": point_stop - point_start,
+        "url": (
+            f"/api/v1/laboratory/m4-threat/results/{result_id}"
+            f"/timeline/playback/chunks/{chunk_index}"
+        ),
+        "media_type": "application/octet-stream",
+        "dtype": "<f4",
+        "shape": [point_stop - point_start, 3],
+        "bytes": payload.nbytes,
+        "sha256": hashlib.sha256(payload).hexdigest(),
+    }
+
+
 @lru_cache(maxsize=4)
 def _read_threat_result_cached(
     root_value: str,
     signature: tuple[int, ...],
 ) -> ThreatReplayResult:
     del signature
-    return read_threat_replay_result(Path(root_value))
+    return read_threat_replay_result_metadata(Path(root_value))
 
 
 @lru_cache(maxsize=4)
diff --git a/tests/test_m49_physical_safety_playback.py b/tests/test_m49_physical_safety_playback.py
new file mode 100644
index 0000000..d97b3a6
--- /dev/null
+++ b/tests/test_m49_physical_safety_playback.py
@@ -0,0 +1,199 @@
+from __future__ import annotations
+
+import hashlib
+import json
+import socket
+from pathlib import Path
+
+import numpy as np
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+from k1link.laboratory.m49_physical_safety_playback import (
+    CHUNK_HEADER,
+    CHUNK_MAGIC,
+    read_m49_physical_safety_playback,
+    seal_m49_physical_safety_playback,
+)
+from k1link.web.m49_physical_safety_playback_api import (
+    build_m49_physical_safety_playback_router,
+)
+
+REPOSITORY_ROOT = Path(__file__).resolve().parents[1]
+
+
+def _sha256(path: Path) -> str:
+    return hashlib.sha256(path.read_bytes()).hexdigest()
+
+
+def _sealed_source(root: Path, *, frame_count: int = 65, cell_count: int = 8) -> Path:
+    root.mkdir()
+    centers = np.column_stack(
+        (
+            np.arange(cell_count, dtype=np.float32) * np.float32(0.15),
+            np.zeros(cell_count, dtype=np.float32),
+        )
+    ).astype(np.float32)
+    states = np.ones((frame_count, cell_count), dtype=np.uint8)
+    z_bounds = np.zeros((frame_count, cell_count, 2), dtype=np.float32)
+    z_bounds[..., 1] = np.float32(0.12)
+    missing_sequence = 17
+    states[missing_sequence] = 0
+    z_bounds[missing_sequence] = np.nan
+    np.save(root / "costmap-cell-centers-xy-m.npy", centers, allow_pickle=False)
+    np.save(root / "costmap-states.npy", states, allow_pickle=False)
+    np.save(root / "costmap-z-bounds-m.npy", z_bounds, allow_pickle=False)
+    frames = [
+        {
+            "source_frame_index": sequence,
+            "session_seconds": sequence / 10,
+            "sample_available": sequence != missing_sequence,
+            "eligible_point_count": 0 if sequence == missing_sequence else cell_count,
+            "ground_point_count": 0 if sequence == missing_sequence else cell_count,
+            "nonground_point_count": 0,
+            "rejected_point_count": 0,
+            "occupied_cell_count": 0,
+        }
+        for sequence in range(frame_count)
+    ]
+    (root / "frames.ndjson").write_text(
+        "".join(json.dumps(frame, sort_keys=True) + "\n" for frame in frames),
+        encoding="utf-8",
+    )
+    source_identity = {"schema_version": "missioncore.test-sealed-source/v1"}
+    source_identity_sha256 = hashlib.sha256(
+        json.dumps(source_identity, sort_keys=True, separators=(",", ":")).encode()
+    ).hexdigest()
+    result_id = "m49-tgs-full-shadow-" + source_identity_sha256
+    report = {
+        "schema_version": "missioncore.m49-tgs-full-shadow-report/v1",
+        "result_id": result_id,
+        "configuration": {
+            "coordinate_frame": "map-gravity-local",
+            "cell_size_m": 0.15,
+            "radius_m": 12.0,
+        },
+        "visual_review": {
+            "state_codes": {
+                "UNOBSERVED": 0,
+                "GROUND_SUPPORT": 1,
+                "NONGROUND_OCCUPIED": 2,
+                "UNKNOWN_REJECTED": 3,
+            }
+        },
+    }
+    (root / "report.json").write_text(json.dumps(report), encoding="utf-8")
+    artifacts = []
+    for name in (
+        "costmap-cell-centers-xy-m.npy",
+        "costmap-states.npy",
+        "costmap-z-bounds-m.npy",
+        "frames.ndjson",
+        "report.json",
+    ):
+        path = root / name
+        artifacts.append(
+            {
+                "path": name,
+                "byte_length": path.stat().st_size,
+                "sha256": _sha256(path),
+            }
+        )
+    (root / "manifest.json").write_text(
+        json.dumps(
+            {
+                "schema_version": "missioncore.m49-tgs-full-shadow-lab/v1",
+                "result_id": result_id,
+                "identity": source_identity,
+                "identity_sha256": source_identity_sha256,
+                "artifacts": artifacts,
+            }
+        ),
+        encoding="utf-8",
+    )
+    return root
+
+
+def test_local_builder_seals_bounded_chunks_without_worker_network(
+    monkeypatch,
+    tmp_path: Path,
+) -> None:
+    source = _sealed_source(tmp_path / "source")
+
+    def forbid_network(*_args: object, **_kwargs: object) -> None:
+        raise AssertionError("local LAB builder attempted network access")
+
+    monkeypatch.setattr(socket, "create_connection", forbid_network)
+    sealed = seal_m49_physical_safety_playback(
+        source_root=source,
+        destination_root=tmp_path / "results",
+        profile_path=(
+            REPOSITORY_ROOT / "config" / "perception" / "m49-physical-safety-shadow-v0.json"
+        ),
+        created_at_utc="2026-08-27T12:00:00Z",
+    )
+
+    assert sealed.manifest["execution"] == {
+        "execution_class": "local-sequential-offline",
+        "worker_role": "realtime-only",
+        "worker_runtime_dependency": False,
+        "worker_requests_required": 0,
+    }
+    playback = sealed.manifest["playback"]
+    assert playback["cell_size_m"] == 0.15
+    assert playback["chunk_frame_count"] == 32
+    assert playback["startup_prebuffer_chunk_count"] == 2
+    assert playback["resident_chunk_count_max"] == 3
+    assert [(chunk["start"], chunk["count"]) for chunk in playback["chunks"]] == [
+        (0, 32),
+        (32, 32),
+        (64, 1),
+    ]
+    first = (sealed.root / playback["chunks"][0]["path"]).read_bytes()
+    magic, start, count, cells, state_bytes, z_bytes = CHUNK_HEADER.unpack_from(first)
+    assert (magic, start, count, cells) == (CHUNK_MAGIC, 0, 32, 8)
+    assert state_bytes == 32 * 8
+    assert z_bytes == 32 * 8 * 2 * 4
+    assert read_m49_physical_safety_playback(sealed.root).result_id == sealed.result_id
+
+
+def test_local_api_serves_only_hash_verified_sealed_tracks(tmp_path: Path) -> None:
+    source = _sealed_source(tmp_path / "source")
+    destination = tmp_path / "results"
+    sealed = seal_m49_physical_safety_playback(
+        source_root=source,
+        destination_root=destination,
+        profile_path=(
+            REPOSITORY_ROOT / "config" / "perception" / "m49-physical-safety-shadow-v0.json"
+        ),
+        created_at_utc="2026-08-27T12:00:00Z",
+    )
+    app = FastAPI()
+    app.include_router(
+        build_m49_physical_safety_playback_router(root_provider=lambda: destination)
+    )
+    client = TestClient(app)
+
+    manifest_response = client.get(
+        f"/api/v1/laboratory/m49/physical-safety-playback/{sealed.result_id}/manifest"
+    )
+    assert manifest_response.status_code == 200
+    manifest = manifest_response.json()
+    assert manifest["execution"]["worker_requests_required"] == 0
+    assert manifest["access"] == "read-only-sealed-local"
+    assert "worker" not in manifest["playback"]["centers"]["url"]
+    assert client.get(manifest["playback"]["centers"]["url"]).status_code == 200
+    assert client.get(manifest["playback"]["chunks"][0]["url"]).status_code == 200
+    source_result_id = sealed.manifest["identity"]["source_result_id"]
+    catalog = client.get(
+        "/api/v1/laboratory/m49/physical-safety-playback/results",
+        params={"source_result_id": source_result_id},
+    )
+    assert catalog.status_code == 200
+    assert [item["result_id"] for item in catalog.json()["items"]] == [sealed.result_id]
+
+    chunk_path = sealed.root / sealed.manifest["playback"]["chunks"][0]["path"]
+    damaged = bytearray(chunk_path.read_bytes())
+    damaged[-1] ^= 1
+    chunk_path.write_bytes(damaged)
+    assert client.get(manifest["playback"]["chunks"][0]["url"]).status_code == 503
diff --git a/tests/test_m4_threat_replay_result.py b/tests/test_m4_threat_replay_result.py
index 28c45b7..c77f4cc 100644
--- a/tests/test_m4_threat_replay_result.py
+++ b/tests/test_m4_threat_replay_result.py
@@ -1,11 +1,18 @@
 from __future__ import annotations
 
+import hashlib
 import json
 from pathlib import Path
 
 from fastapi.routing import APIRoute
+from pytest import MonkeyPatch
 
-from k1link.perception.threat_replay import read_threat_replay_result
+from k1link.perception.geometry import RecordedGeometryStore
+from k1link.perception.threat_replay import (
+    read_threat_replay_result,
+    read_threat_replay_result_metadata,
+)
+from k1link.perception.threat_timeline import RecordedThreatTimeline
 from k1link.sessions import RecordedCameraFrame
 from k1link.web.m4_threat_replay_api import build_m4_threat_replay_router
 
@@ -128,6 +135,9 @@ def test_m4_6_timeline_is_indexed_and_spatial_evidence_is_chunked() -> None:
     get_timeline = _endpoint("/api/v1/laboratory/m4-threat/results/{result_id}/timeline")
     get_chunk = _endpoint("/api/v1/laboratory/m4-threat/results/{result_id}/timeline/chunk")
     get_playback = _endpoint("/api/v1/laboratory/m4-threat/results/{result_id}/timeline/playback")
+    get_playback_chunk = _endpoint(
+        "/api/v1/laboratory/m4-threat/results/{result_id}/timeline/playback/chunks/{chunk_index}"
+    )
 
     timeline = get_timeline(RESULT_ID)
     assert timeline["schema_version"] == "missioncore.recorded-spatial-evidence-timeline/v1"
@@ -178,6 +188,33 @@ def test_m4_6_timeline_is_indexed_and_spatial_evidence_is_chunked() -> None:
     assert playback["track"]["shape"] == [9_207_270, 3]
     assert playback["track"]["bytes"] == 110_487_240
     assert len(playback["track"]["sha256"]) == 64
+    assert playback["chunk_frame_count"] == 24
+    assert playback["resident_chunk_count_max"] == 4
+    assert playback["forward_prefetch_chunk_count"] == 1
+    assert len(playback["chunks"]) == 188
+    first_chunk = playback["chunks"][0]
+    assert first_chunk["start"] == 0
+    assert first_chunk["count"] == 24
+    assert first_chunk["bytes"] < 3 * 1024 * 1024
+    chunk_response = get_playback_chunk(RESULT_ID, 0)
+    assert len(chunk_response.body) == first_chunk["bytes"]
+    assert hashlib.sha256(chunk_response.body).hexdigest() == first_chunk["sha256"]
+
+
+def test_m4_6_timeline_metadata_defers_large_geometry_archives(
+    monkeypatch: MonkeyPatch,
+) -> None:
+    result = read_threat_replay_result_metadata(RESULTS_ROOT / RESULT_ID)
+
+    def reject_eager_load(*_args: object, **_kwargs: object) -> RecordedGeometryStore:
+        raise AssertionError("timeline metadata eagerly loaded the geometry archives")
+
+    monkeypatch.setattr(RecordedGeometryStore, "from_repository", reject_eager_load)
+    timeline = RecordedThreatTimeline(repository_root=REPOSITORY_ROOT, result=result)
+
+    assert timeline.metadata()["frame_count"] == 4489
+    assert timeline.metadata()["maximum_source_points_per_frame"] == 3092
+    assert timeline._store is None
 
 
 def test_m4_6_exact_camera_endpoint_is_bound_to_selected_visual_sequence() -> None: