From 10019a454a54be98e8d866086f34bdd3ca069c82 Mon Sep 17 00:00:00 2001
From: DCCONSTRUCTIONS <dcconstructions@MacBook-Pro-DCCONSTRUCTIONS-2.local>
Date: Thu, 23 Jul 2026 20:13:40 +0300
Subject: [PATCH] feat(perception): publish immutable lab session instances

---
 .../components/ObservationSessionSelect.tsx   |  26 +-
 .../src/core/observation/sessionArchive.ts    |  91 ++
 .../src/styles/observation-sessions.css       |  16 +
 docs/09_OBSERVATION_SESSIONS.md               |  32 +
 .../perception/LAB_E21_REPORT_2026-07-23.md   |  29 +
 src/k1link/compute/__init__.py                |   8 +
 src/k1link/compute/lab_instances.py           | 940 ++++++++++++++++++
 src/k1link/device_plugins/xgrids_k1/cli.py    | 131 ++-
 src/k1link/sessions/__init__.py               |   4 +
 src/k1link/sessions/lab_cache.py              | 139 +++
 src/k1link/sessions/models.py                 |  35 +-
 src/k1link/sessions/store.py                  | 328 +++++-
 src/k1link/web/session_api.py                 |  27 +-
 tests/test_session_api.py                     |  33 +
 tests/test_session_lab_cache.py               |  89 ++
 tests/test_session_store.py                   |  72 ++
 16 files changed, 1970 insertions(+), 30 deletions(-)
 create mode 100644 src/k1link/compute/lab_instances.py
 create mode 100644 src/k1link/sessions/lab_cache.py
 create mode 100644 tests/test_session_lab_cache.py

diff --git a/apps/control-station/src/components/ObservationSessionSelect.tsx b/apps/control-station/src/components/ObservationSessionSelect.tsx
index ffc264b..f4844a6 100644
--- a/apps/control-station/src/components/ObservationSessionSelect.tsx
+++ b/apps/control-station/src/components/ObservationSessionSelect.tsx
@@ -208,7 +208,15 @@ export function ObservationSessionSelect({
                         <i data-session-visual-state={visualState} aria-hidden="true" />
                       </span>
                       <span className="nodedc-dropdown-option__body">
-                        <span className="nodedc-dropdown-option__label">{session.label}</span>
+                        <span className="nodedc-dropdown-option__label">
+                          {session.lab &&
+                          !session.label.startsWith(`${session.lab.labId} ·`) ? (
+                            <span className="observation-session-option__lab">
+                              {session.lab.labId}
+                            </span>
+                          ) : null}
+                          {session.label}
+                        </span>
                         <span className="nodedc-dropdown-option__description">
                           {sessionDescription(session)}
                         </span>
@@ -263,10 +271,18 @@ export function ObservationSessionSelect({
       title="Удалить сохранённую сессию?"
       description={deleteTarget ? <>
         <strong>{deleteTarget.label}</strong>
-        <p>
-          Сессия, исходные данные наблюдения, подготовленная Rerun-запись и
-          видеоматериалы будут удалены с этого сервера без возможности восстановления.
-        </p>
+        {deleteTarget.lab ? (
+          <p>
+            Будут удалены только LAB-запись из каталога и её подготовленный кэш.
+            Исходная запись {deleteTarget.lab.sourceSessionId} и зафиксированный
+            лабораторный результат останутся неизменными.
+          </p>
+        ) : (
+          <p>
+            Сессия, исходные данные наблюдения, подготовленная Rerun-запись и
+            видеоматериалы будут удалены с этого сервера без возможности восстановления.
+          </p>
+        )}
         {sessions.error && sessions.deletingSessionId === null ? (
           <p className="observation-session-delete-error" role="alert">{sessions.error}</p>
         ) : null}
diff --git a/apps/control-station/src/core/observation/sessionArchive.ts b/apps/control-station/src/core/observation/sessionArchive.ts
index 5d88940..7285465 100644
--- a/apps/control-station/src/core/observation/sessionArchive.ts
+++ b/apps/control-station/src/core/observation/sessionArchive.ts
@@ -9,6 +9,18 @@ export type ObservationSessionStatus =
   | "interrupted"
   | "failed";
 
+export interface ObservationLabInstance {
+  labId: string;
+  sourceSessionId: string;
+  resultKind: string;
+  resultId: string;
+  sourceResultId: string | null;
+  configSha256: string | null;
+  runCreatedAtUtc: string;
+  publishedAtUtc: string;
+  provenance: Readonly<Record<string, unknown>>;
+}
+
 export interface ObservationSessionSummary {
   id: string;
   label: string;
@@ -19,6 +31,7 @@ export interface ObservationSessionSummary {
   durationSeconds: number;
   replayable: boolean;
   preparation: ObservationSessionCatalogPreparation | null;
+  lab: ObservationLabInstance | null;
 }
 
 export interface ObservationSessionCatalog {
@@ -135,6 +148,18 @@ const ITEM_KEYS = new Set([
   "duration_seconds",
   "replayable",
   "preparation",
+  "lab",
+]);
+const LAB_KEYS = new Set([
+  "lab_id",
+  "source_session_id",
+  "result_kind",
+  "result_id",
+  "source_result_id",
+  "config_sha256",
+  "run_created_at_utc",
+  "published_at_utc",
+  "provenance",
 ]);
 const CATALOG_PREPARATION_KEYS = new Set([
   "preparation_id",
@@ -344,6 +369,72 @@ function decodeItem(value: unknown, index: number): ObservationSessionSummary {
     durationSeconds: value.duration_seconds,
     replayable: value.replayable,
     preparation: decodeCatalogPreparation(value.preparation, id),
+    lab: decodeLabInstance(value.lab, id),
+  };
+}
+
+function decodeLabInstance(
+  value: unknown,
+  sessionId: string,
+): ObservationLabInstance | null {
+  if (value === null || value === undefined) return null;
+  if (!isRecord(value)) {
+    throw new ObservationSessionContractError(
+      `LAB-привязка сессии ${sessionId} должна быть объектом или null.`,
+    );
+  }
+  assertExactKeys(value, LAB_KEYS, `LAB-привязка сессии ${sessionId}`);
+  const labId = requireString(value.lab_id, `lab(${sessionId}).lab_id`, 36);
+  if (!/^LAB [A-Z][A-Z0-9._-]{0,31}$/.test(labId)) {
+    throw new ObservationSessionContractError("Каталог содержит некорректный LAB-маркер.");
+  }
+  const sourceSessionId = requireString(
+    value.source_session_id,
+    `lab(${sessionId}).source_session_id`,
+    128,
+  );
+  const resultKind = requireString(value.result_kind, `lab(${sessionId}).result_kind`, 128);
+  const resultId = requireString(value.result_id, `lab(${sessionId}).result_id`, 128);
+  const sourceResultId = value.source_result_id === null
+    ? null
+    : requireString(value.source_result_id, `lab(${sessionId}).source_result_id`, 128);
+  for (const [field, entry] of [
+    ["source_session_id", sourceSessionId],
+    ["result_kind", resultKind],
+    ["result_id", resultId],
+    ["source_result_id", sourceResultId],
+  ] as const) {
+    if (entry !== null && !SAFE_ID.test(entry)) {
+      throw new ObservationSessionContractError(
+        `Поле lab.${field} содержит небезопасный идентификатор.`,
+      );
+    }
+  }
+  const configSha256 = value.config_sha256 === null
+    ? null
+    : requireString(value.config_sha256, `lab(${sessionId}).config_sha256`, 64);
+  if (configSha256 !== null && !SHA256.test(configSha256)) {
+    throw new ObservationSessionContractError("LAB-конфигурация не содержит SHA-256.");
+  }
+  if (!isRecord(value.provenance)) {
+    throw new ObservationSessionContractError("LAB provenance должен быть JSON-объектом.");
+  }
+  return {
+    labId,
+    sourceSessionId,
+    resultKind,
+    resultId,
+    sourceResultId,
+    configSha256,
+    runCreatedAtUtc: requireUtcTimestamp(
+      value.run_created_at_utc,
+      `lab(${sessionId}).run_created_at_utc`,
+    ),
+    publishedAtUtc: requireUtcTimestamp(
+      value.published_at_utc,
+      `lab(${sessionId}).published_at_utc`,
+    ),
+    provenance: value.provenance,
   };
 }
 
diff --git a/apps/control-station/src/styles/observation-sessions.css b/apps/control-station/src/styles/observation-sessions.css
index 421a805..d060a45 100644
--- a/apps/control-station/src/styles/observation-sessions.css
+++ b/apps/control-station/src/styles/observation-sessions.css
@@ -201,6 +201,22 @@
   white-space: nowrap;
 }
 
+.observation-session-option__lab {
+  align-items: center;
+  background: color-mix(in srgb, var(--accent, #b8ff5a) 14%, transparent);
+  border: 1px solid color-mix(in srgb, var(--accent, #b8ff5a) 42%, transparent);
+  border-radius: 999px;
+  color: var(--accent, #b8ff5a);
+  display: inline-flex;
+  font-size: 9px;
+  font-weight: 800;
+  letter-spacing: 0.08em;
+  line-height: 1;
+  margin-right: 7px;
+  padding: 4px 6px 3px;
+  vertical-align: 1px;
+}
+
 .observation-session-menu__empty {
   display: grid;
   min-height: 9rem;
diff --git a/docs/09_OBSERVATION_SESSIONS.md b/docs/09_OBSERVATION_SESSIONS.md
index 378dd8b..8c9abca 100644
--- a/docs/09_OBSERVATION_SESSIONS.md
+++ b/docs/09_OBSERVATION_SESSIONS.md
@@ -102,6 +102,38 @@ the obsolete browser poll; it does not cancel the process-owned conversion.
 A queued job may legitimately wait behind another export and therefore uses the
 overall preparation deadline rather than the active-export heartbeat timeout.
 
+## Immutable LAB instances
+
+An accepted experiment is published as a new saved-session identity instead of
+changing the AI result selected for its source recording. A LAB instance binds:
+
+- a stable `LAB E…` marker and opaque session id;
+- the immutable source observation session;
+- the exact result, source-result and configuration SHA-256 identities;
+- run and publication timestamps plus JSON provenance;
+- a content-addressed compute job, LiDAR pack and integrated visual result.
+
+The source evidence remains the only raw sensor master. A LAB replay cache and
+unchanged camera inputs use hard links on the same filesystem; no second copy of
+the source RRD, video or native K1 capture is created. Derived arrays are stored
+only when the run did not already persist a viewer-ready form. Deleting a LAB
+catalog entry cannot delete the referenced source session, and a source session
+with published LAB instances fails closed on deletion.
+
+The visual result is resolved by the LAB session id, so `LAB E19` and `LAB E21`
+can coexist over `RAVNOVES00` without “latest accepted result” replacing an
+earlier experiment. The operator can open either row in **Сохранённые сессии**
+and use the same **Объекты 2D / Сегментация / Кубы 3D** controls. First
+publication must also warm the result-specific Rerun overlay; later opens reuse
+that verified cache and do not rerun AI inference.
+
+E21 is a bounded special case: its worker persisted 121 semantic mask hashes,
+not duplicate mask pixels. Its visual publication materializes a mask only
+after an exact SHA-256 match against the immutable accepted E19 semantic
+reference. The seven detector frames replaced by the bounded latest-wins queue
+remain explicit empty frames. This preserves the measured near-real-time
+behavior rather than presenting a fabricated gap-free run.
+
 The first preparation of a long capture can take time because every decodable
 point/pose message and every valid K1 `ModelingReport` is projected into RRD.
 Later openings reuse a verified, digest-bound cache. Derived RRD cache v9 is
diff --git a/experiments/perception/LAB_E21_REPORT_2026-07-23.md b/experiments/perception/LAB_E21_REPORT_2026-07-23.md
index dc9cd96..61c252f 100644
--- a/experiments/perception/LAB_E21_REPORT_2026-07-23.md
+++ b/experiments/perception/LAB_E21_REPORT_2026-07-23.md
@@ -185,6 +185,35 @@ short nominal run, an intentional overload/backpressure run, disconnect/reconnec
 recovery, and then a longer soak. Model-quality work should remain separately measured
 so that visual improvements cannot hide a runtime regression.
 
+## Immutable Mission Core publication
+
+E21 is published as the separate saved-session instance
+`lab-e21-d0201712`, displayed as
+`LAB E21 · Real-time 1× · RTX 4090 · d0201712`. It does not replace the
+result bound to `RAVNOVES00`, and it coexists with the comparison baseline
+`lab-e19-36964643`.
+
+| Publication item | Value |
+| --- | --- |
+| LAB source session | `20260720T065719Z_viewer_live` |
+| Visual result | `e10-integrated-perception-d0ecafd5e56f8ef132b8cb88f45ec275aa17470c682c6cce7c08f5597bfd7bd6` |
+| Visual frames | 601 |
+| Worker result frames | 594 |
+| Explicit latest-wins replacement frames | 12, 239–242, 433, 498 |
+| SHA-matched semantic masks | 121 / 121 |
+| Accepted cuboids materialized | 881 |
+| Raw source payloads copied | no |
+| Source RRD storage | same inode through hard link |
+| Base replay readiness | 0.03 s observed |
+| Initial visual overlay publication | 111.47 s observed |
+| Warm visual overlay retrieval | 0.04 s observed |
+
+The 111.47-second step is viewer-container publication from already computed
+results, not detector, semantic or fusion inference. It is completed before
+operator handoff. Warm UI openings reuse the resulting 7.88 MB Rerun overlay.
+The base source remains the full 8:55.718 recording; E21 AI output covers the
+accepted 59.994-second envelope beginning at source camera time 35.421857 s.
+
 ## Evidence
 
 - Source report: `.runtime/compute-experiments/e21/20260723T155125Z-e21-source.json`
diff --git a/src/k1link/compute/__init__.py b/src/k1link/compute/__init__.py
index 867f575..0e073e1 100644
--- a/src/k1link/compute/__init__.py
+++ b/src/k1link/compute/__init__.py
@@ -34,6 +34,11 @@ from .jobs import (
     prepare_camera_compute_job,
     validate_camera_compute_job,
 )
+from .lab_instances import (
+    PublishedIntegratedLabInstance,
+    publish_e21_lab_instance,
+    publish_integrated_lab_instance,
+)
 from .live_perception import (
     LIVE_INGRESS_SCHEMA,
     LIVE_INGRESS_WIRE_SCHEMA,
@@ -109,6 +114,7 @@ __all__ = [
     "LiveIngressEvent",
     "LivePerceptionIngress",
     "IntegratedPerceptionOverlayStore",
+    "PublishedIntegratedLabInstance",
     "IntegratedPerceptionResult",
     "LiveReplayQualificationResult",
     "MultiratePerceptionArtifact",
@@ -137,6 +143,8 @@ __all__ = [
     "validate_recorded_perception_epoch_result",
     "validate_live_replay_qualification_result",
     "validate_integrated_perception_result",
+    "publish_e21_lab_instance",
+    "publish_integrated_lab_instance",
     "validate_multirate_perception_qualification_result",
     "prepare_recorded_qualification_slice",
     "DetectionFrame",
diff --git a/src/k1link/compute/lab_instances.py b/src/k1link/compute/lab_instances.py
new file mode 100644
index 0000000..e979a73
--- /dev/null
+++ b/src/k1link/compute/lab_instances.py
@@ -0,0 +1,940 @@
+"""Immutable LAB catalog projections for accepted integrated perception runs."""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import os
+import secrets
+import shutil
+import stat
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any
+
+import numpy as np
+
+from k1link.artifacts import write_json_atomic
+from k1link.sessions import (
+    LabSessionBinding,
+    SessionIntegrityError,
+    SessionStore,
+    publish_lab_replay_cache,
+)
+
+from .integrated_perception import (
+    IntegratedPerceptionResult,
+    validate_integrated_perception_result,
+)
+from .jobs import CameraComputeJob, validate_camera_compute_job
+
+
+@dataclass(frozen=True, slots=True)
+class PublishedIntegratedLabInstance:
+    binding: LabSessionBinding
+    job: CameraComputeJob
+    result: IntegratedPerceptionResult
+
+
+def publish_integrated_lab_instance(
+    *,
+    repository_root: Path,
+    source_result_root: Path,
+    lab_session_id: str,
+    lab_id: str,
+    display_name: str,
+    provenance: dict[str, Any] | None = None,
+) -> PublishedIntegratedLabInstance:
+    """Snapshot one accepted visual result as a separately replayable LAB run.
+
+    Large immutable camera, LiDAR, array and RRD payloads are hard-linked.
+    Content-addressed manifests are rebound to the LAB session id, so the
+    existing viewer resolves one exact result instead of selecting whichever
+    source-session result happens to be newest.
+    """
+
+    root = repository_root.expanduser().resolve(strict=True)
+    jobs_root = root / ".runtime" / "compute-jobs"
+    results_root = root / ".runtime" / "compute-experiments" / "e10" / "worker-results"
+    packs_root = root / ".runtime" / "compute-experiments" / "e10" / "lidar-packs"
+    source_result_path = source_result_root.expanduser().resolve(strict=True)
+    source_document = _read_object(source_result_path / "result.json", source_result_path)
+    identity = source_document.get("identity")
+    if not isinstance(identity, dict) or not isinstance(identity.get("job_id"), str):
+        raise SessionIntegrityError("integrated LAB source has no job identity")
+    source_job_root = jobs_root / identity["job_id"]
+    source = validate_integrated_perception_result(
+        source_job_root,
+        source_result_path,
+        packs_root,
+    )
+    if not source.accepted:
+        raise SessionIntegrityError("only accepted integrated results can become LAB instances")
+
+    lab_job = _publish_lab_job(source.job, jobs_root, lab_session_id)
+    lab_pack = _publish_lab_pack(source, lab_job, packs_root, lab_session_id)
+    lab_result = _publish_lab_result(
+        source,
+        lab_job,
+        lab_pack,
+        results_root,
+        lab_session_id,
+    )
+    validated = validate_integrated_perception_result(
+        lab_job.job_root,
+        lab_result,
+        packs_root,
+    )
+    store = SessionStore(root)
+    publish_lab_replay_cache(
+        store.data_dir,
+        source_session_id=source.job.session_id,
+        lab_session_id=lab_session_id,
+    )
+    configuration = source_document["identity"].get("configuration")
+    profile_sha256 = (
+        configuration.get("profile_sha256") if isinstance(configuration, dict) else None
+    )
+    if not isinstance(profile_sha256, str) or len(profile_sha256) != 64:
+        profile_sha256 = None
+    binding = store.publish_lab_instance(
+        session_id=lab_session_id,
+        source_session_id=source.job.session_id,
+        display_name=display_name,
+        lab_id=lab_id,
+        result_kind="e10-integrated-perception",
+        result_id=validated.result_id,
+        source_result_id=source.result_id,
+        config_sha256=profile_sha256,
+        run_created_at_utc=source.created_at_utc,
+        provenance={
+            "schema_version": "missioncore.integrated-lab-publication/v1",
+            "storage_mode": "hard-linked-immutable-payloads",
+            "source_job_id": source.job.job_id,
+            "projected_job_id": lab_job.job_id,
+            "source_lidar_pack_id": source.pack_root.name,
+            "projected_lidar_pack_id": lab_pack.name,
+            **(provenance or {}),
+        },
+    )
+    return PublishedIntegratedLabInstance(binding=binding, job=lab_job, result=validated)
+
+
+def publish_e21_lab_instance(
+    *,
+    repository_root: Path,
+    e21_result_root: Path,
+    worker_result_root: Path,
+    semantic_reference_result_root: Path,
+    lab_session_id: str,
+    lab_id: str,
+    display_name: str,
+) -> PublishedIntegratedLabInstance:
+    """Publish the accepted E21 envelope as an exact 60-second visual LAB run.
+
+    E21 persisted semantic mask identities but intentionally did not duplicate
+    mask pixels. The immutable full-session reference contains those exact
+    pixels. Publication therefore materializes a bounded viewer projection only
+    after every E21 mask SHA-256 matches the corresponding reference mask.
+    Detector latest-wins replacements remain explicit empty frames.
+    """
+
+    root = repository_root.expanduser().resolve(strict=True)
+    jobs_root = root / ".runtime" / "compute-jobs"
+    results_root = root / ".runtime" / "compute-experiments" / "e10" / "worker-results"
+    packs_root = root / ".runtime" / "compute-experiments" / "e10" / "lidar-packs"
+    reference_path = semantic_reference_result_root.expanduser().resolve(strict=True)
+    reference_document = _read_object(reference_path / "result.json", reference_path)
+    reference_identity = reference_document.get("identity")
+    if not isinstance(reference_identity, dict) or not isinstance(
+        reference_identity.get("job_id"), str
+    ):
+        raise SessionIntegrityError("E21 semantic reference has no job identity")
+    reference = validate_integrated_perception_result(
+        jobs_root / reference_identity["job_id"],
+        reference_path,
+        packs_root,
+    )
+    if not reference.accepted or reference.source_start_frame_index != 0:
+        raise SessionIntegrityError("E21 semantic reference is not an accepted zero-based run")
+
+    e21_root = e21_result_root.expanduser().resolve(strict=True)
+    worker_root = worker_result_root.expanduser().resolve(strict=True)
+    e21_document, e21_report, worker_document = _validate_e21_inputs(
+        e21_root,
+        worker_root,
+    )
+    frame_count = int(e21_report["metrics"]["source"]["events_admitted"]["camera-frame"])
+    if frame_count < 2 or frame_count > reference.frame_count:
+        raise SessionIntegrityError("E21 frame count is outside the semantic reference")
+
+    lab_job = _publish_lab_job(reference.job, jobs_root, lab_session_id)
+    lab_pack = _publish_e21_pack(
+        reference,
+        lab_job,
+        packs_root,
+        lab_session_id,
+        frame_count,
+    )
+    lab_result = _publish_e21_visual_result(
+        reference=reference,
+        lab_job=lab_job,
+        lab_pack=lab_pack,
+        results_root=results_root,
+        lab_session_id=lab_session_id,
+        frame_count=frame_count,
+        e21_root=e21_root,
+        e21_document=e21_document,
+        e21_report=e21_report,
+        worker_root=worker_root,
+        worker_document=worker_document,
+    )
+    validated = validate_integrated_perception_result(
+        lab_job.job_root,
+        lab_result,
+        packs_root,
+    )
+    store = SessionStore(root)
+    publish_lab_replay_cache(
+        store.data_dir,
+        source_session_id=reference.job.session_id,
+        lab_session_id=lab_session_id,
+    )
+    binding = store.publish_lab_instance(
+        session_id=lab_session_id,
+        source_session_id=reference.job.session_id,
+        display_name=display_name,
+        lab_id=lab_id,
+        result_kind="e21-realtime-envelope",
+        result_id=validated.result_id,
+        source_result_id=str(e21_document["result_id"]),
+        config_sha256=str(e21_report["identity"]["profile_sha256"]),
+        run_created_at_utc=str(e21_report["created_at_utc"]),
+        provenance={
+            "schema_version": "missioncore.e21-lab-publication/v1",
+            "storage_mode": "hard-linked-source-and-bounded-derived-projection",
+            "e21_result_id": e21_document["result_id"],
+            "worker_result_id": worker_document["result_id"],
+            "semantic_reference_result_id": reference.result_id,
+            "semantic_mask_reconstruction": "exact-sha256-match",
+            "detector_replacement_frames": [
+                12,
+                239,
+                240,
+                241,
+                242,
+                433,
+                498,
+            ],
+            "visual_frame_count": frame_count,
+            "source_payloads_mutated": False,
+        },
+    )
+    return PublishedIntegratedLabInstance(binding=binding, job=lab_job, result=validated)
+
+
+def _validate_e21_inputs(
+    e21_root: Path,
+    worker_root: Path,
+) -> tuple[dict[str, Any], dict[str, Any], dict[str, Any]]:
+    e21_document = _read_object(e21_root / "result.json", e21_root)
+    e21_report = _read_object(e21_root / "report.json", e21_root)
+    report_descriptor = e21_document.get("report")
+    if (
+        e21_document.get("schema_version") != "missioncore.e21-realtime-envelope-result/v1"
+        or e21_document.get("result_id") != e21_root.name
+        or e21_document.get("state") != "accepted"
+        or not isinstance(report_descriptor, dict)
+        or report_descriptor.get("path") != "report.json"
+        or report_descriptor.get("byte_length") != (e21_root / "report.json").stat().st_size
+        or report_descriptor.get("sha256") != _sha256(e21_root / "report.json")
+        or e21_report.get("schema_version") != "missioncore.e21-realtime-envelope-report/v1"
+        or e21_report.get("result_id") != e21_root.name
+        or e21_report.get("state") != "accepted"
+        or not isinstance(e21_report.get("identity"), dict)
+        or not isinstance(e21_report.get("metrics"), dict)
+    ):
+        raise SessionIntegrityError("E21 accepted result identity is inconsistent")
+
+    worker_document = _read_object(worker_root / "result.json", worker_root)
+    e21_identity = e21_report["identity"]
+    if (
+        worker_document.get("schema_version") != "missioncore.e15-shadow-inference-result/v1"
+        or worker_document.get("result_id") != worker_root.name
+        or worker_document.get("result_id") != e21_identity.get("worker_result_id")
+        or _sha256(worker_root / "result.json") != e21_identity.get("worker_result_sha256")
+        or not isinstance(worker_document.get("identity"), dict)
+        or not isinstance(worker_document.get("artifacts"), list)
+    ):
+        raise SessionIntegrityError("E21 worker result identity is inconsistent")
+    required = {
+        "e15-semantic-frames": "semantic-frames.jsonl",
+        "e15-fusion-frames": "fusion-frames.jsonl",
+        "e15-world-state": "world-state.jsonl",
+        "worker-gpu-telemetry": "gpu-telemetry.jsonl",
+    }
+    descriptors = {
+        value.get("kind"): value
+        for value in worker_document["artifacts"]
+        if isinstance(value, dict) and value.get("kind") in required
+    }
+    if set(descriptors) != set(required):
+        raise SessionIntegrityError("E21 worker artifacts are incomplete")
+    for kind, name in required.items():
+        descriptor = descriptors[kind]
+        path = worker_root / name
+        if (
+            descriptor.get("path") != name
+            or descriptor.get("byte_length") != path.stat().st_size
+            or descriptor.get("sha256") != _sha256(path)
+        ):
+            raise SessionIntegrityError("E21 worker artifact identity changed")
+    return e21_document, e21_report, worker_document
+
+
+def _publish_e21_pack(
+    reference: IntegratedPerceptionResult,
+    job: CameraComputeJob,
+    packs_root: Path,
+    lab_session_id: str,
+    frame_count: int,
+) -> Path:
+    source_manifest = _read_object(reference.pack_root / "manifest.json", reference.pack_root)
+    with np.load(reference.pack_root / "lidar-pack.npz", allow_pickle=False) as arrays:
+        cloud_end = int(arrays["cloud_offsets"][frame_count])
+        payload = {
+            "frame_indices": arrays["frame_indices"][:frame_count].copy(),
+            "source_frame_indices": arrays["source_frame_indices"][:frame_count].copy(),
+            "session_seconds": arrays["session_seconds"][:frame_count].copy(),
+            "sample_available": arrays["sample_available"][:frame_count].copy(),
+            "cloud_offsets": arrays["cloud_offsets"][: frame_count + 1].copy(),
+            "cloud_points_map": arrays["cloud_points_map"][:cloud_end].copy(),
+            "pose_positions_map": arrays["pose_positions_map"][:frame_count].copy(),
+            "pose_quaternions_map_from_lidar": arrays[
+                "pose_quaternions_map_from_lidar"
+            ][:frame_count].copy(),
+            "lidar_camera_delta_ms": arrays["lidar_camera_delta_ms"][:frame_count].copy(),
+            "pose_point_delta_ms": arrays["pose_point_delta_ms"][:frame_count].copy(),
+            "intrinsic_fx_fy_cx_cy": arrays["intrinsic_fx_fy_cx_cy"].copy(),
+            "distortion_kb4": arrays["distortion_kb4"].copy(),
+            "t_camera_from_lidar": arrays["t_camera_from_lidar"].copy(),
+        }
+    identity = json.loads(json.dumps(source_manifest["identity"]))
+    identity.update(
+        {
+            "job_id": job.job_id,
+            "input_sha256": job.input_sha256,
+            "session_id": lab_session_id,
+            "frame_count": frame_count,
+            "source_start_frame_index": 0,
+            "source_end_frame_index": frame_count - 1,
+            "available_lidar_frames": int(np.count_nonzero(payload["sample_available"])),
+            "point_count": int(payload["cloud_points_map"].shape[0]),
+            "timeline_start_seconds": float(payload["session_seconds"][0]),
+            "timeline_end_seconds": float(payload["session_seconds"][-1]),
+            "visual_projection": "accepted-e21-envelope/v1",
+        }
+    )
+    identity_sha256 = hashlib.sha256(_canonical_json(identity)).hexdigest()
+    pack_id = f"e10-lidar-pack-{identity_sha256}"
+    destination = packs_root / pack_id
+    if destination.exists():
+        existing = _read_object(destination / "manifest.json", destination)
+        if existing.get("identity") != identity:
+            raise SessionIntegrityError("E21 LAB LiDAR pack id collides")
+        return destination
+    staging = _staging_directory(packs_root, pack_id)
+    try:
+        arrays_path = staging / "lidar-pack.npz"
+        np.savez_compressed(arrays_path, **payload)
+        os.chmod(arrays_path, 0o600)
+        write_json_atomic(
+            staging / "manifest.json",
+            {
+                **source_manifest,
+                "pack_id": pack_id,
+                "identity_sha256": identity_sha256,
+                "identity": identity,
+                "created_at_utc": str(source_manifest["created_at_utc"]),
+                "artifact": {
+                    "path": arrays_path.name,
+                    "media_type": "application/x-npz",
+                    "byte_length": arrays_path.stat().st_size,
+                    "sha256": _sha256(arrays_path),
+                },
+            },
+        )
+        _publish_directory(staging, destination)
+    finally:
+        _remove_staging(staging)
+    return destination
+
+
+def _publish_e21_visual_result(
+    *,
+    reference: IntegratedPerceptionResult,
+    lab_job: CameraComputeJob,
+    lab_pack: Path,
+    results_root: Path,
+    lab_session_id: str,
+    frame_count: int,
+    e21_root: Path,
+    e21_document: dict[str, Any],
+    e21_report: dict[str, Any],
+    worker_root: Path,
+    worker_document: dict[str, Any],
+) -> Path:
+    with np.load(reference.arrays_path, allow_pickle=False) as arrays:
+        frame_times = arrays["frame_times_ns"][:frame_count].copy()
+        reference_semantic_indices = arrays["semantic_frame_indices"]
+        selected = reference_semantic_indices < frame_count
+        reference_indices = reference_semantic_indices[selected].copy()
+        reference_masks = arrays["semantic_masks"][selected].copy()
+
+    semantic_rows = _read_jsonl(worker_root / "semantic-frames.jsonl")
+    if [row.get("frame_index") for row in semantic_rows] != reference_indices.tolist():
+        raise SessionIntegrityError("E21 semantic frame schedule changed")
+    for row, mask in zip(semantic_rows, reference_masks, strict=True):
+        if row.get("mask_sha256") != hashlib.sha256(mask.tobytes()).hexdigest():
+            raise SessionIntegrityError("E21 semantic mask does not match immutable reference")
+        row["schema_version"] = "missioncore.e10-semantic-frame/v1"
+        row["session_seconds"] = float(frame_times[int(row["frame_index"])]) / 1_000_000_000
+
+    fusion_source = {
+        int(row["source_frame_index"]): row
+        for row in _read_jsonl(worker_root / "fusion-frames.jsonl")
+    }
+    world_source = {
+        int(row["source_frame_index"]): row
+        for row in _read_jsonl(worker_root / "world-state.jsonl")
+    }
+    if set(fusion_source) != set(world_source):
+        raise SessionIntegrityError("E21 fusion and world timelines differ")
+    fusion_rows: list[dict[str, Any]] = []
+    world_rows: list[dict[str, Any]] = []
+    dropped_indices: list[int] = []
+    for index in range(frame_count):
+        session_seconds = float(frame_times[index]) / 1_000_000_000
+        fusion = fusion_source.get(index)
+        world = world_source.get(index)
+        if fusion is None or world is None:
+            dropped_indices.append(index)
+            fusion_rows.append(
+                {
+                    "schema_version": "missioncore.e10-fusion-frame/v1",
+                    "frame_index": index,
+                    "source_frame_index": index,
+                    "session_seconds": session_seconds,
+                    "fusion_state": "detector-dropped-latest-wins",
+                    "semantic_source_frame_index": None,
+                    "semantic_status": "unavailable",
+                    "objects": [],
+                }
+            )
+            world_rows.append(_dropped_world_row(index, session_seconds))
+            continue
+        normalized_fusion = json.loads(json.dumps(fusion))
+        normalized_fusion.update(
+            {
+                "schema_version": "missioncore.e10-fusion-frame/v1",
+                "frame_index": index,
+                "source_frame_index": index,
+                "session_seconds": session_seconds,
+            }
+        )
+        normalized_world = json.loads(json.dumps(world))
+        normalized_world.update(
+            {
+                "frame_index": index,
+                "source_frame_index": index,
+                "session_seconds": session_seconds,
+            }
+        )
+        fusion_rows.append(normalized_fusion)
+        world_rows.append(normalized_world)
+    expected_drops = int(
+        e21_report["metrics"]["worker"]["detector"]["queue"]["dropped_overflow"]
+    )
+    if len(dropped_indices) != expected_drops:
+        raise SessionIntegrityError("E21 detector replacement accounting changed")
+
+    box_offsets = [0]
+    centers: list[list[float]] = []
+    half_sizes: list[list[float]] = []
+    quaternions: list[list[float]] = []
+    colors: list[list[int]] = []
+    for row in fusion_rows:
+        for item in row["objects"]:
+            if not str(item.get("cuboid_status", "")).startswith("accepted-"):
+                continue
+            centers.append(item["cuboid_center_map"])
+            half_sizes.append(item["cuboid_half_size"])
+            quaternions.append(item["cuboid_quaternion_xyzw"])
+            colors.append(_cuboid_color(item))
+        box_offsets.append(len(centers))
+
+    reference_identity = _read_object(
+        reference.result_root / "result.json",
+        reference.result_root,
+    )["identity"]
+    worker_identity = worker_document["identity"]
+    configuration = {
+        "pipeline": "e21-shadow-realtime-envelope-visual-projection/v1",
+        "profile_sha256": e21_report["identity"]["profile_sha256"],
+        "profile": {
+            "source": reference_identity["configuration"]["profile"]["source"],
+            "replay": {
+                "speed": 1.0,
+                "bounded_latest_wins": True,
+                "detector_replacement_frames": dropped_indices,
+            },
+        },
+        "e21_result_id": e21_document["result_id"],
+        "worker_result_id": worker_document["result_id"],
+        "semantic_mask_materialization": {
+            "mode": "immutable-reference-exact-sha256",
+            "reference_result_id": reference.result_id,
+            "matched_masks": len(semantic_rows),
+        },
+    }
+    selection = {
+        "frame_count": frame_count,
+        "source_start_frame_index": 0,
+        "source_end_frame_index": frame_count - 1,
+        "timeline_start_seconds": float(frame_times[0]) / 1_000_000_000,
+        "timeline_end_seconds": float(frame_times[-1]) / 1_000_000_000,
+        "timeline_sha256": hashlib.sha256(frame_times.tobytes()).hexdigest(),
+    }
+    identity = {
+        "schema_version": "missioncore.e10-integrated-perception-identity/v1",
+        "job_id": lab_job.job_id,
+        "input_sha256": lab_job.input_sha256,
+        "session_id": lab_session_id,
+        "source_id": lab_job.source_id,
+        "lidar_pack_id": lab_pack.name,
+        "selection": selection,
+        "configuration": configuration,
+        "models": worker_identity["models"],
+    }
+    identity_sha256 = hashlib.sha256(_canonical_json(identity)).hexdigest()
+    result_id = f"e10-integrated-perception-{identity_sha256}"
+    destination = results_root / result_id
+    if destination.exists():
+        existing = _read_object(destination / "result.json", destination)
+        if existing.get("identity") != identity:
+            raise SessionIntegrityError("E21 LAB visual result id collides")
+        return destination
+
+    staging = _staging_directory(results_root, result_id)
+    try:
+        semantic_path = staging / "semantic-frames.jsonl"
+        fusion_path = staging / "fusion-frames.jsonl"
+        world_path = staging / "world-state.jsonl"
+        arrays_path = staging / "transient-perception.npz"
+        gpu_path = staging / "gpu-telemetry.jsonl"
+        report_path = staging / "run-report.json"
+        _write_jsonl(semantic_path, semantic_rows)
+        _write_jsonl(fusion_path, fusion_rows)
+        _write_jsonl(world_path, world_rows)
+        np.savez_compressed(
+            arrays_path,
+            frame_times_ns=frame_times.astype(np.int64, copy=False),
+            semantic_frame_indices=reference_indices.astype(np.int64, copy=False),
+            semantic_masks=reference_masks.astype(np.uint8, copy=False),
+            support_offsets=np.zeros(frame_count + 1, dtype=np.int64),
+            support_points=np.empty((0, 3), dtype=np.float32),
+            support_colors=np.empty((0, 3), dtype=np.uint8),
+            box_offsets=np.asarray(box_offsets, dtype=np.int64),
+            box_centers=np.asarray(centers, dtype=np.float32).reshape((-1, 3)),
+            box_half_sizes=np.asarray(half_sizes, dtype=np.float32).reshape((-1, 3)),
+            box_quaternions=np.asarray(quaternions, dtype=np.float32).reshape((-1, 4)),
+            box_colors=np.asarray(colors, dtype=np.uint8).reshape((-1, 4)),
+        )
+        shutil.copyfile(worker_root / "gpu-telemetry.jsonl", gpu_path)
+        report = {
+            "schema_version": "missioncore.e10-integrated-perception-report/v1",
+            "result_id": result_id,
+            "created_at_utc": e21_report["created_at_utc"],
+            "state": "accepted",
+            "ground_truth": False,
+            "identity": identity,
+            "acceptance": {
+                "accepted": True,
+                "navigation_or_safety_accepted": False,
+                "checks": {
+                    "e21_envelope_accepted": True,
+                    "semantic_hashes_exact": True,
+                    "detector_replacements_explicit": True,
+                    "source_payloads_immutable": True,
+                },
+            },
+            "metrics": {
+                **e21_report["metrics"],
+                "visual_projection": {
+                    "frames": frame_count,
+                    "semantic_masks": len(semantic_rows),
+                    "detector_replacement_frames": dropped_indices,
+                    "accepted_cuboids": len(centers),
+                },
+            },
+            "runtime": _read_object(worker_root / "run-report.json", worker_root).get(
+                "runtime", {}
+            ),
+            "limitations": [
+                "This is the exact accepted recorded E21 envelope, not a physical live K1 gate.",
+                "Seven latest-wins detector replacements are explicit empty visual frames.",
+                "Semantic pixels are materialized only after exact SHA-256 reference matches.",
+                "LiDAR support points remain in the immutable source scene and are not duplicated.",
+                "Navigation and safety authority remain disabled.",
+            ],
+        }
+        write_json_atomic(report_path, report)
+        artifacts = [
+            _artifact_descriptor(
+                "e10-semantic-frames",
+                semantic_path,
+                "missioncore.e10-semantic-frame/v1",
+            ),
+            _artifact_descriptor(
+                "e10-fusion-frames",
+                fusion_path,
+                "missioncore.e10-fusion-frame/v1",
+            ),
+            _artifact_descriptor(
+                "e10-world-state",
+                world_path,
+                "missioncore.live-perception-world-state/v1",
+            ),
+            _artifact_descriptor("e10-transient-perception", arrays_path, None),
+            _artifact_descriptor("worker-gpu-telemetry", gpu_path, None),
+            _artifact_descriptor(
+                "e10-run-report",
+                report_path,
+                "missioncore.e10-integrated-perception-report/v1",
+            ),
+        ]
+        write_json_atomic(
+            staging / "result.json",
+            {
+                "schema_version": "missioncore.e10-integrated-perception-result/v1",
+                "result_id": result_id,
+                "identity_sha256": identity_sha256,
+                "identity": identity,
+                "created_at_utc": e21_report["created_at_utc"],
+                "ground_truth": False,
+                "publication_scope": "recorded-integrated-realtime-qualification-only",
+                "acceptance_state": "accepted",
+                "frames_processed": frame_count,
+                "artifacts": artifacts,
+            },
+        )
+        _publish_directory(staging, destination)
+    finally:
+        _remove_staging(staging)
+    return destination
+
+
+def _dropped_world_row(frame_index: int, session_seconds: float) -> dict[str, Any]:
+    return {
+        "schema_version": "missioncore.live-perception-world-state/v1",
+        "frame_index": frame_index,
+        "source_frame_index": frame_index,
+        "session_seconds": session_seconds,
+        "fusion_state": "detector-dropped-latest-wins",
+        "object_count": 0,
+        "objects": [],
+        "delivery": {
+            "health": "degraded",
+            "semantic_status": "unavailable",
+            "result_age_ms": None,
+            "projection_status": "explicit-detector-replacement",
+        },
+        "coordinate_frames": {
+            "sensor_relative": "k1-lidar",
+            "vehicle_body": "unavailable-no-rig-to-vehicle-transform",
+            "world": "k1-map",
+        },
+        "clearance": {
+            "schema": "diagnostic-polar-obstacle-clearance/v1",
+            "state": "unavailable",
+            "frame": "k1-lidar",
+            "front_m": None,
+            "observed_sector_fraction": 0.0,
+            "sector_ranges_m": [None] * 72,
+        },
+    }
+
+
+def _cuboid_color(item: dict[str, Any]) -> list[int]:
+    key = f"e10:{item.get('association_group', 'object')}:{item.get('track_id', 0)}"
+    digest = hashlib.sha256(key.encode()).digest()
+    return [64 + digest[0] % 176, 64 + digest[1] % 176, 64 + digest[2] % 176, 88]
+
+
+def _read_jsonl(path: Path) -> list[dict[str, Any]]:
+    rows: list[dict[str, Any]] = []
+    with path.open(encoding="utf-8") as stream:
+        for line in stream:
+            value = json.loads(line)
+            if not isinstance(value, dict):
+                raise SessionIntegrityError("LAB JSONL row is not an object")
+            rows.append(value)
+    return rows
+
+
+def _write_jsonl(path: Path, rows: list[dict[str, Any]]) -> None:
+    with path.open("x", encoding="utf-8") as stream:
+        for row in rows:
+            stream.write(
+                json.dumps(
+                    row,
+                    ensure_ascii=False,
+                    sort_keys=True,
+                    separators=(",", ":"),
+                    allow_nan=False,
+                )
+            )
+            stream.write("\n")
+        stream.flush()
+        os.fsync(stream.fileno())
+    os.chmod(path, 0o600)
+
+
+def _artifact_descriptor(
+    kind: str,
+    path: Path,
+    schema_version: str | None,
+) -> dict[str, Any]:
+    return {
+        "kind": kind,
+        "path": path.name,
+        "schema_version": schema_version,
+        "byte_length": path.stat().st_size,
+        "sha256": _sha256(path),
+    }
+
+
+def _publish_lab_job(
+    source: CameraComputeJob,
+    jobs_root: Path,
+    lab_session_id: str,
+) -> CameraComputeJob:
+    manifest = _read_object(source.manifest_path, source.job_root)
+    input_document = json.loads(json.dumps(manifest["input"]))
+    input_document["session_id"] = lab_session_id
+    input_sha256 = hashlib.sha256(_canonical_json(input_document)).hexdigest()
+    job_id = f"recorded-camera-{input_sha256[:24]}"
+    destination = jobs_root / job_id
+    if destination.exists():
+        existing = validate_camera_compute_job(destination)
+        if existing.session_id != lab_session_id:
+            raise SessionIntegrityError("LAB compute job id collides")
+        return existing
+    staging = _staging_directory(jobs_root, job_id)
+    try:
+        _hardlink_tree(source.job_root / "input", staging / "input")
+        write_json_atomic(
+            staging / "job.json",
+            {
+                **manifest,
+                "job_id": job_id,
+                "input_sha256": input_sha256,
+                "input": input_document,
+            },
+        )
+        _publish_directory(staging, destination)
+    finally:
+        _remove_staging(staging)
+    return validate_camera_compute_job(destination)
+
+
+def _publish_lab_pack(
+    source: IntegratedPerceptionResult,
+    job: CameraComputeJob,
+    packs_root: Path,
+    lab_session_id: str,
+) -> Path:
+    source_manifest = _read_object(source.pack_root / "manifest.json", source.pack_root)
+    identity = json.loads(json.dumps(source_manifest["identity"]))
+    identity.update(
+        {
+            "job_id": job.job_id,
+            "input_sha256": job.input_sha256,
+            "session_id": lab_session_id,
+        }
+    )
+    identity_sha256 = hashlib.sha256(_canonical_json(identity)).hexdigest()
+    pack_id = f"e10-lidar-pack-{identity_sha256}"
+    destination = packs_root / pack_id
+    if destination.exists():
+        existing = _read_object(destination / "manifest.json", destination)
+        if existing.get("identity") != identity:
+            raise SessionIntegrityError("LAB LiDAR pack id collides")
+        return destination
+    staging = _staging_directory(packs_root, pack_id)
+    try:
+        os.link(
+            source.pack_root / "lidar-pack.npz",
+            staging / "lidar-pack.npz",
+            follow_symlinks=False,
+        )
+        write_json_atomic(
+            staging / "manifest.json",
+            {
+                **source_manifest,
+                "pack_id": pack_id,
+                "identity_sha256": identity_sha256,
+                "identity": identity,
+            },
+        )
+        _publish_directory(staging, destination)
+    finally:
+        _remove_staging(staging)
+    return destination
+
+
+def _publish_lab_result(
+    source: IntegratedPerceptionResult,
+    job: CameraComputeJob,
+    pack_root: Path,
+    results_root: Path,
+    lab_session_id: str,
+) -> Path:
+    source_document = _read_object(source.result_root / "result.json", source.result_root)
+    identity = json.loads(json.dumps(source_document["identity"]))
+    identity.update(
+        {
+            "job_id": job.job_id,
+            "input_sha256": job.input_sha256,
+            "session_id": lab_session_id,
+            "lidar_pack_id": pack_root.name,
+        }
+    )
+    identity_sha256 = hashlib.sha256(_canonical_json(identity)).hexdigest()
+    result_id = f"e10-integrated-perception-{identity_sha256}"
+    destination = results_root / result_id
+    if destination.exists():
+        existing = _read_object(destination / "result.json", destination)
+        if existing.get("identity") != identity:
+            raise SessionIntegrityError("LAB integrated result id collides")
+        return destination
+    staging = _staging_directory(results_root, result_id)
+    try:
+        descriptors: list[dict[str, Any]] = []
+        for descriptor in source_document["artifacts"]:
+            if descriptor["kind"] == "e10-run-report":
+                continue
+            source_path = source.result_root / descriptor["path"]
+            target = staging / descriptor["path"]
+            os.link(source_path, target, follow_symlinks=False)
+            descriptors.append(dict(descriptor))
+
+        report = _read_object(source.report_path, source.result_root)
+        report.update(
+            {
+                "result_id": result_id,
+                "identity": identity,
+                "lab_projection": {
+                    "schema_version": "missioncore.integrated-lab-projection/v1",
+                    "source_session_id": source.job.session_id,
+                    "source_result_id": source.result_id,
+                    "lab_session_id": lab_session_id,
+                    "payloads_recomputed": False,
+                },
+            }
+        )
+        report_path = staging / "run-report.json"
+        write_json_atomic(report_path, report)
+        descriptors.append(
+            {
+                "kind": "e10-run-report",
+                "path": report_path.name,
+                "schema_version": "missioncore.e10-integrated-perception-report/v1",
+                "byte_length": report_path.stat().st_size,
+                "sha256": _sha256(report_path),
+            }
+        )
+        descriptor_order = {
+            value["kind"]: index for index, value in enumerate(source_document["artifacts"])
+        }
+        descriptors.sort(key=lambda value: descriptor_order[value["kind"]])
+        write_json_atomic(
+            staging / "result.json",
+            {
+                **source_document,
+                "result_id": result_id,
+                "identity_sha256": identity_sha256,
+                "identity": identity,
+                "artifacts": descriptors,
+            },
+        )
+        _publish_directory(staging, destination)
+    finally:
+        _remove_staging(staging)
+    return destination
+
+
+def _hardlink_tree(source: Path, destination: Path) -> None:
+    source_root = source.resolve(strict=True)
+    destination.mkdir(mode=0o700, parents=True)
+    for current, directories, files in os.walk(source_root):
+        current_path = Path(current)
+        relative = current_path.relative_to(source_root)
+        target_root = destination / relative
+        target_root.mkdir(mode=0o700, parents=True, exist_ok=True)
+        directories.sort()
+        files.sort()
+        for filename in files:
+            path = current_path / filename
+            metadata = path.lstat()
+            if stat.S_ISLNK(metadata.st_mode) or not stat.S_ISREG(metadata.st_mode):
+                raise SessionIntegrityError("LAB source tree contains a non-regular file")
+            os.link(path, target_root / filename, follow_symlinks=False)
+
+
+def _staging_directory(root: Path, identity: str) -> Path:
+    root.mkdir(mode=0o700, parents=True, exist_ok=True)
+    staging = root / f".{identity}.{secrets.token_hex(12)}.tmp"
+    staging.mkdir(mode=0o700)
+    return staging
+
+
+def _publish_directory(staging: Path, destination: Path) -> None:
+    try:
+        os.replace(staging, destination)
+    except OSError:
+        if not destination.is_dir():
+            raise
+
+
+def _remove_staging(path: Path) -> None:
+    if path.exists():
+        shutil.rmtree(path)
+
+
+def _read_object(path: Path, root: Path) -> dict[str, Any]:
+    resolved = path.resolve(strict=True)
+    if resolved.parent != root.resolve(strict=True) or resolved.is_symlink():
+        raise SessionIntegrityError("LAB manifest escapes its immutable root")
+    value = json.loads(resolved.read_text(encoding="utf-8"))
+    if not isinstance(value, dict):
+        raise SessionIntegrityError("LAB manifest is not a JSON object")
+    return value
+
+
+def _canonical_json(value: object) -> bytes:
+    return json.dumps(
+        value,
+        ensure_ascii=False,
+        sort_keys=True,
+        separators=(",", ":"),
+        allow_nan=False,
+    ).encode("utf-8")
+
+
+def _sha256(path: Path) -> str:
+    digest = hashlib.sha256()
+    with path.open("rb") as stream:
+        for block in iter(lambda: stream.read(1024 * 1024), b""):
+            digest.update(block)
+    return digest.hexdigest()
diff --git a/src/k1link/device_plugins/xgrids_k1/cli.py b/src/k1link/device_plugins/xgrids_k1/cli.py
index 8c39594..ae4833e 100644
--- a/src/k1link/device_plugins/xgrids_k1/cli.py
+++ b/src/k1link/device_plugins/xgrids_k1/cli.py
@@ -17,7 +17,11 @@ from rich.table import Table
 
 from k1link import __version__
 from k1link.artifacts import write_json_atomic
-from k1link.compute import prepare_camera_compute_job
+from k1link.compute import (
+    prepare_camera_compute_job,
+    publish_e21_lab_instance,
+    publish_integrated_lab_instance,
+)
 from k1link.device_plugins.xgrids_k1.analyze import (
     DEFAULT_STREAM_SUMMARY_MAX_PAYLOAD_BYTES,
     MAX_STREAM_SUMMARY_PAYLOAD_BYTES,
@@ -70,12 +74,17 @@ compute_app = typer.Typer(
     help="Bounded, content-addressed handoffs to external compute workers.",
     no_args_is_help=True,
 )
+lab_app = typer.Typer(
+    help="Append-only publication of reproducible laboratory session instances.",
+    no_args_is_help=True,
+)
 app.add_typer(ble_app, name="ble")
 app.add_typer(net_app, name="net")
 app.add_typer(usb_app, name="usb")
 app.add_typer(analyze_app, name="analyze")
 app.add_typer(authority_app, name="authority")
 app.add_typer(compute_app, name="compute")
+app.add_typer(lab_app, name="lab")
 
 
 class ToolStatus(TypedDict):
@@ -304,6 +313,126 @@ def doctor(
         console.print(f"- {note}")
 
 
+@lab_app.command("publish-integrated")
+def publish_integrated_lab(
+    result: Annotated[
+        Path,
+        typer.Option(
+            exists=True,
+            file_okay=False,
+            readable=True,
+            resolve_path=True,
+            help="Accepted e10-integrated-perception result directory.",
+        ),
+    ],
+    session_id: Annotated[
+        str,
+        typer.Option("--session-id", help="New immutable LAB session id."),
+    ],
+    lab_id: Annotated[
+        str,
+        typer.Option("--lab-id", help="LAB marker, for example 'LAB E19'."),
+    ],
+    display_name: Annotated[
+        str,
+        typer.Option("--display-name", help="Operator-facing saved-session title."),
+    ],
+) -> None:
+    """Publish one exact accepted visual run without copying raw sensor bytes."""
+
+    repository_root = Path(__file__).resolve().parents[4]
+    try:
+        published = publish_integrated_lab_instance(
+            repository_root=repository_root,
+            source_result_root=result,
+            lab_session_id=session_id,
+            lab_id=lab_id,
+            display_name=display_name,
+        )
+    except (OSError, SessionIntegrityError, ValueError) as exc:
+        console.print(f"[red]LAB publication failed:[/red] {exc}")
+        raise typer.Exit(code=2) from exc
+    console.print(
+        "[green]LAB instance published.[/green] "
+        f"session={published.binding.session_id}; "
+        f"source={published.binding.source_session_id}; "
+        f"result={published.binding.result_id}; "
+        "raw_sensor_payloads_copied=false"
+    )
+
+
+@lab_app.command("publish-e21")
+def publish_e21_lab(
+    result: Annotated[
+        Path,
+        typer.Option(
+            exists=True,
+            file_okay=False,
+            readable=True,
+            resolve_path=True,
+            help="Accepted E21 realtime-envelope result directory.",
+        ),
+    ],
+    worker_result: Annotated[
+        Path,
+        typer.Option(
+            "--worker-result",
+            exists=True,
+            file_okay=False,
+            readable=True,
+            resolve_path=True,
+            help="Exact E15 shadow-worker result referenced by E21.",
+        ),
+    ],
+    semantic_reference: Annotated[
+        Path,
+        typer.Option(
+            "--semantic-reference",
+            exists=True,
+            file_okay=False,
+            readable=True,
+            resolve_path=True,
+            help="Accepted E10 result containing the SHA-matched semantic masks.",
+        ),
+    ],
+    session_id: Annotated[
+        str,
+        typer.Option("--session-id", help="New immutable LAB session id."),
+    ],
+    lab_id: Annotated[
+        str,
+        typer.Option("--lab-id", help="LAB marker, for example 'LAB E21'."),
+    ],
+    display_name: Annotated[
+        str,
+        typer.Option("--display-name", help="Operator-facing saved-session title."),
+    ],
+) -> None:
+    """Publish the exact accepted E21 envelope as a visual 60-second LAB run."""
+
+    repository_root = Path(__file__).resolve().parents[4]
+    try:
+        published = publish_e21_lab_instance(
+            repository_root=repository_root,
+            e21_result_root=result,
+            worker_result_root=worker_result,
+            semantic_reference_result_root=semantic_reference,
+            lab_session_id=session_id,
+            lab_id=lab_id,
+            display_name=display_name,
+        )
+    except (OSError, SessionIntegrityError, ValueError) as exc:
+        console.print(f"[red]E21 LAB publication failed:[/red] {exc}")
+        raise typer.Exit(code=2) from exc
+    console.print(
+        "[green]E21 LAB instance published.[/green] "
+        f"session={published.binding.session_id}; "
+        f"source={published.binding.source_session_id}; "
+        f"result={published.binding.result_id}; "
+        "source_payloads_mutated=false"
+    )
+
+
 @app.command("serve")
 def serve_console(
     port: Annotated[
diff --git a/src/k1link/sessions/__init__.py b/src/k1link/sessions/__init__.py
index d756b83..592d4e1 100644
--- a/src/k1link/sessions/__init__.py
+++ b/src/k1link/sessions/__init__.py
@@ -5,6 +5,7 @@ from .active import (
     ActiveSessionLeaseError,
     recover_stale_active_session_marker,
 )
+from .lab_cache import publish_lab_replay_cache
 from .media import (
     RECORDED_MEDIA_MANIFEST_SCHEMA,
     RecordedMediaFile,
@@ -14,6 +15,7 @@ from .media import (
     validate_recorded_media_timeline,
 )
 from .models import (
+    LabSessionBinding,
     LayoutConflictError,
     ObservationArtifactCandidate,
     ObservationSessionCandidate,
@@ -50,6 +52,7 @@ from .store import (
 
 __all__ = [
     "LayoutConflictError",
+    "LabSessionBinding",
     "ActiveSessionLease",
     "ActiveSessionLeaseError",
     "MaterializedRecording",
@@ -59,6 +62,7 @@ __all__ = [
     "ObservationSessionCandidate",
     "PluginRecordingExportCancelled",
     "PluginRecordingExportError",
+    "publish_lab_replay_cache",
     "RecordingMaterializationCancelled",
     "RecordedMediaArtifact",
     "RECORDED_MEDIA_MANIFEST_SCHEMA",
diff --git a/src/k1link/sessions/lab_cache.py b/src/k1link/sessions/lab_cache.py
new file mode 100644
index 0000000..cd96c78
--- /dev/null
+++ b/src/k1link/sessions/lab_cache.py
@@ -0,0 +1,139 @@
+"""Publish zero-copy replay caches for immutable LAB session aliases."""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import os
+import stat
+from pathlib import Path
+from typing import Any
+
+from k1link.artifacts import write_json_atomic
+
+from .models import SessionIntegrityError
+from .recording import (
+    COMPATIBLE_CACHE_SCHEMAS,
+    RECORDING_CACHE_FILENAME,
+    RECORDING_CACHE_SIDECAR_FILENAME,
+)
+
+
+def publish_lab_replay_cache(
+    data_dir: Path,
+    *,
+    source_session_id: str,
+    lab_session_id: str,
+) -> None:
+    """Hard-link a validated source RRD and clone its path-free sidecars.
+
+    The RRD bytes are immutable and independent of the catalog id, so a hard
+    link gives every LAB instance a normal cache endpoint without consuming a
+    second copy of the multi-gigabyte recording.
+    """
+
+    root = data_dir.expanduser().resolve(strict=True)
+    recordings = (root / "recordings").resolve(strict=True)
+    source_root = recordings / source_session_id
+    source_rrd = source_root / RECORDING_CACHE_FILENAME
+    source_sidecar = source_root / RECORDING_CACHE_SIDECAR_FILENAME
+    _require_regular(source_rrd, source_root)
+    _require_regular(source_sidecar, source_root)
+    document = _read_object(source_sidecar)
+    if (
+        document.get("schema_version") not in COMPATIBLE_CACHE_SCHEMAS
+        or document.get("session_id") != source_session_id
+    ):
+        raise SessionIntegrityError("source recording cache is incompatible")
+
+    target_root = recordings / lab_session_id
+    target_root.mkdir(mode=0o700, parents=False, exist_ok=True)
+    if target_root.is_symlink() or target_root.resolve() != target_root:
+        raise SessionIntegrityError("LAB recording cache root is unsafe")
+    target_rrd = target_root / RECORDING_CACHE_FILENAME
+    if target_rrd.exists():
+        source_stat = _require_regular(source_rrd, source_root)
+        target_stat = _require_regular(target_rrd, target_root)
+        if (source_stat.st_dev, source_stat.st_ino) != (target_stat.st_dev, target_stat.st_ino):
+            raise SessionIntegrityError("LAB recording cache already contains different bytes")
+    else:
+        temporary = target_root / f".{RECORDING_CACHE_FILENAME}.{os.getpid()}.tmp"
+        try:
+            os.link(source_rrd, temporary, follow_symlinks=False)
+            os.replace(temporary, target_rrd)
+        finally:
+            temporary.unlink(missing_ok=True)
+    target_stat = _require_regular(target_rrd, target_root)
+    cloned = {
+        **document,
+        "session_id": lab_session_id,
+        "recording_mtime_ns": target_stat.st_mtime_ns,
+    }
+    write_json_atomic(target_root / RECORDING_CACHE_SIDECAR_FILENAME, cloned)
+    os.chmod(target_root / RECORDING_CACHE_SIDECAR_FILENAME, 0o600)
+    _clone_recorded_media_sidecars(
+        root / "recorded-media-preparations",
+        source_session_id=source_session_id,
+        lab_session_id=lab_session_id,
+    )
+
+
+def _clone_recorded_media_sidecars(
+    root: Path,
+    *,
+    source_session_id: str,
+    lab_session_id: str,
+) -> None:
+    if not root.is_dir():
+        return
+    for source in root.iterdir():
+        if source.is_symlink() or not source.is_file():
+            continue
+        try:
+            document = _read_object(source)
+        except (OSError, SessionIntegrityError):
+            continue
+        if document.get("session_id") != source_session_id:
+            continue
+        artifact_id = document.get("artifact_id")
+        if not isinstance(artifact_id, str):
+            raise SessionIntegrityError("recorded media sidecar has no artifact identity")
+        body = {key: value for key, value in document.items() if key != "checksum_sha256"}
+        body["session_id"] = lab_session_id
+        checksum = hashlib.sha256(_canonical_json(body)).hexdigest()
+        target = root / _media_sidecar_name(lab_session_id, artifact_id)
+        write_json_atomic(target, {**body, "checksum_sha256": checksum})
+        os.chmod(target, 0o600)
+
+
+def _media_sidecar_name(session_id: str, artifact_id: str) -> str:
+    key = f"{session_id}\0{artifact_id}".encode()
+    return f"{hashlib.sha256(key).hexdigest()}.json"
+
+
+def _canonical_json(value: object) -> bytes:
+    return json.dumps(
+        value,
+        ensure_ascii=False,
+        sort_keys=True,
+        separators=(",", ":"),
+        allow_nan=False,
+    ).encode("utf-8")
+
+
+def _read_object(path: Path) -> dict[str, Any]:
+    value = json.loads(path.read_text(encoding="utf-8"))
+    if not isinstance(value, dict):
+        raise SessionIntegrityError("cache sidecar is not a JSON object")
+    return value
+
+
+def _require_regular(path: Path, parent: Path) -> os.stat_result:
+    metadata = path.lstat()
+    if (
+        stat.S_ISLNK(metadata.st_mode)
+        or not stat.S_ISREG(metadata.st_mode)
+        or path.parent.resolve(strict=True) != parent.resolve(strict=True)
+    ):
+        raise SessionIntegrityError("cache artifact is not a confined regular file")
+    return metadata
diff --git a/src/k1link/sessions/models.py b/src/k1link/sessions/models.py
index 3b28572..58159c4 100644
--- a/src/k1link/sessions/models.py
+++ b/src/k1link/sessions/models.py
@@ -28,6 +28,35 @@ class LayoutConflictError(SessionStoreError):
     """A workspace layout revision changed since the caller loaded it."""
 
 
+@dataclass(frozen=True, slots=True)
+class LabSessionBinding:
+    """Immutable provenance for one derived laboratory replay."""
+
+    session_id: str
+    source_session_id: str
+    lab_id: str
+    result_kind: str
+    result_id: str
+    source_result_id: str | None
+    config_sha256: str | None
+    run_created_at_utc: str
+    published_at_utc: str
+    provenance: dict[str, Any]
+
+    def as_dict(self) -> dict[str, Any]:
+        return {
+            "lab_id": self.lab_id,
+            "source_session_id": self.source_session_id,
+            "result_kind": self.result_kind,
+            "result_id": self.result_id,
+            "source_result_id": self.source_result_id,
+            "config_sha256": self.config_sha256,
+            "run_created_at_utc": self.run_created_at_utc,
+            "published_at_utc": self.published_at_utc,
+            "provenance": self.provenance,
+        }
+
+
 @dataclass(frozen=True, slots=True)
 class SessionSource:
     source_id: str
@@ -81,9 +110,10 @@ class SessionSummary:
     total_bytes: int
     replayable: bool
     origin: str
+    lab: LabSessionBinding | None = None
 
     def as_dict(self) -> dict[str, Any]:
-        return {
+        document: dict[str, Any] = {
             "schema_version": "missioncore.observation-session-summary/v1",
             "session_id": self.session_id,
             "display_name": self.display_name,
@@ -97,6 +127,9 @@ class SessionSummary:
             "replayable": self.replayable,
             "origin": self.origin,
         }
+        if self.lab is not None:
+            document["lab"] = self.lab.as_dict()
+        return document
 
 
 @dataclass(frozen=True, slots=True)
diff --git a/src/k1link/sessions/store.py b/src/k1link/sessions/store.py
index 1d887d0..414ef98 100644
--- a/src/k1link/sessions/store.py
+++ b/src/k1link/sessions/store.py
@@ -16,6 +16,7 @@ from uuid import uuid4
 from k1link.artifacts import utc_now_iso
 
 from .models import (
+    LabSessionBinding,
     LayoutConflictError,
     ObservationArtifactCandidate,
     ObservationSessionCandidate,
@@ -39,6 +40,10 @@ from .plugin_contract import ObservationArchiveSource
 IDENTIFIER_PATTERN = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._-]{0,127}$")
 MAX_LAYOUT_BYTES = 256 * 1024
 DATABASE_NAME = "mission-core.sqlite3"
+LAB_ARCHIVE_ID = "missioncore.lab-instances"
+LAB_ORIGIN = "missioncore.lab-instance/v1"
+LAB_ID_PATTERN = re.compile(r"^LAB [A-Z][A-Z0-9._-]{0,31}$")
+SHA256_PATTERN = re.compile(r"^[a-f0-9]{64}$")
 
 SCHEMA_SQL = """
 CREATE TABLE IF NOT EXISTS observation_sessions (
@@ -94,6 +99,24 @@ CREATE TABLE IF NOT EXISTS observation_session_sources (
         ON DELETE CASCADE
 );
 
+CREATE TABLE IF NOT EXISTS observation_lab_instances (
+    session_id TEXT PRIMARY KEY
+        REFERENCES observation_sessions(session_id) ON DELETE CASCADE,
+    source_session_id TEXT NOT NULL
+        REFERENCES observation_sessions(session_id) ON DELETE RESTRICT,
+    lab_id TEXT NOT NULL,
+    result_kind TEXT NOT NULL,
+    result_id TEXT NOT NULL,
+    source_result_id TEXT,
+    config_sha256 TEXT,
+    run_created_at_utc TEXT NOT NULL,
+    published_at_utc TEXT NOT NULL,
+    provenance_json TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS observation_lab_instances_source
+ON observation_lab_instances(source_session_id, published_at_utc DESC);
+
 CREATE TABLE IF NOT EXISTS workspace_layouts (
     workspace_id TEXT PRIMARY KEY,
     layout_schema_version INTEGER NOT NULL,
@@ -162,7 +185,18 @@ class SessionStore:
                 "WHERE plugin_id = ? AND archive_id = ? AND allowed_root = ?",
                 (source.plugin_id, source.archive_id, str(allowed_root)),
             ).fetchall()
-            stale = [row["session_id"] for row in indexed if row["session_id"] not in discovered]
+            referenced_sources = {
+                row["source_session_id"]
+                for row in connection.execute(
+                    "SELECT DISTINCT source_session_id FROM observation_lab_instances"
+                ).fetchall()
+            }
+            stale = [
+                row["session_id"]
+                for row in indexed
+                if row["session_id"] not in discovered
+                and row["session_id"] not in referenced_sources
+            ]
             connection.executemany(
                 "DELETE FROM observation_sessions WHERE session_id = ?",
                 ((session_id,) for session_id in stale),
@@ -193,9 +227,31 @@ class SessionStore:
                 "ORDER BY COALESCE(started_at_utc, '') DESC, session_id DESC LIMIT ?",
                 parameters,
             ).fetchall()
+            lab_rows = (
+                {
+                    row["session_id"]: row
+                    for row in connection.execute(
+                        "SELECT * FROM observation_lab_instances WHERE session_id IN "
+                        f"({','.join('?' for _ in rows)})",  # noqa: S608 - placeholder count only
+                        tuple(row["session_id"] for row in rows),
+                    ).fetchall()
+                }
+                if rows
+                else {}
+            )
         has_more = len(rows) > limit
         selected = rows[:limit]
-        items = tuple(_summary_from_row(row) for row in selected)
+        items = tuple(
+            _summary_from_row(
+                row,
+                lab=(
+                    _lab_binding_from_row(lab_rows[row["session_id"]])
+                    if row["session_id"] in lab_rows
+                    else None
+                ),
+            )
+            for row in selected
+        )
         next_cursor = items[-1].session_id if has_more and items else None
         return SessionPage(items=items, next_cursor=next_cursor)
 
@@ -218,6 +274,10 @@ class SessionStore:
                 "FROM observation_session_artifacts WHERE session_id = ? ORDER BY artifact_id",
                 (session_id,),
             ).fetchall()
+            lab_row = connection.execute(
+                "SELECT * FROM observation_lab_instances WHERE session_id = ?",
+                (session_id,),
+            ).fetchone()
         sources = tuple(
             SessionSource(
                 source_id=source["source_id"],
@@ -240,7 +300,191 @@ class SessionStore:
             )
             for artifact in artifact_rows
         )
-        return SessionDetail(summary=_summary_from_row(row), sources=sources, artifacts=artifacts)
+        return SessionDetail(
+            summary=_summary_from_row(
+                row,
+                lab=None if lab_row is None else _lab_binding_from_row(lab_row),
+            ),
+            sources=sources,
+            artifacts=artifacts,
+        )
+
+    def get_lab_instance(self, session_id: str) -> LabSessionBinding | None:
+        """Return immutable LAB provenance without exposing filesystem locators."""
+
+        _validate_identifier(session_id, "session id")
+        with self._connect() as connection:
+            row = connection.execute(
+                "SELECT * FROM observation_lab_instances WHERE session_id = ?",
+                (session_id,),
+            ).fetchone()
+        return None if row is None else _lab_binding_from_row(row)
+
+    def publish_lab_instance(
+        self,
+        *,
+        session_id: str,
+        source_session_id: str,
+        display_name: str,
+        lab_id: str,
+        result_kind: str,
+        result_id: str,
+        run_created_at_utc: str,
+        source_result_id: str | None = None,
+        config_sha256: str | None = None,
+        provenance: dict[str, Any] | None = None,
+    ) -> LabSessionBinding:
+        """Append one immutable catalog projection over an existing source session.
+
+        Artifact/source rows are copied as references to the sealed evidence.
+        No raw payload is copied and the LAB row uses a distinct archive id so
+        device-plugin reconciliation cannot replace it.
+        """
+
+        _validate_identifier(session_id, "LAB session id")
+        _validate_identifier(source_session_id, "source session id")
+        if session_id == source_session_id:
+            raise ValueError("LAB session id must differ from its source")
+        if LAB_ID_PATTERN.fullmatch(lab_id) is None:
+            raise ValueError("LAB id must use the form 'LAB E21'")
+        _validate_identifier(result_kind, "LAB result kind")
+        _validate_identifier(result_id, "LAB result id")
+        if source_result_id is not None:
+            _validate_identifier(source_result_id, "LAB source result id")
+        if config_sha256 is not None and SHA256_PATTERN.fullmatch(config_sha256) is None:
+            raise ValueError("LAB configuration SHA-256 is invalid")
+        normalized_name = display_name.strip()
+        if not 1 <= len(normalized_name) <= 160:
+            raise ValueError("LAB display name must contain 1..160 characters")
+        _require_utc_timestamp(run_created_at_utc, "LAB run creation time")
+        serialized_provenance = _serialize_provenance(provenance or {})
+        published_at = utc_now_iso()
+
+        with self._lock, self._connect() as connection:
+            connection.execute("BEGIN IMMEDIATE")
+            source = connection.execute(
+                "SELECT * FROM observation_sessions WHERE session_id = ?",
+                (source_session_id,),
+            ).fetchone()
+            if source is None:
+                connection.rollback()
+                raise SessionNotFoundError("LAB source observation session was not found")
+            if (
+                connection.execute(
+                    "SELECT 1 FROM observation_lab_instances WHERE session_id = ?",
+                    (source_session_id,),
+                ).fetchone()
+                is not None
+            ):
+                connection.rollback()
+                raise SessionIntegrityError("LAB instances cannot be chained")
+
+            existing = connection.execute(
+                "SELECT * FROM observation_lab_instances WHERE session_id = ?",
+                (session_id,),
+            ).fetchone()
+            expected = {
+                "source_session_id": source_session_id,
+                "lab_id": lab_id,
+                "result_kind": result_kind,
+                "result_id": result_id,
+                "source_result_id": source_result_id,
+                "config_sha256": config_sha256,
+                "run_created_at_utc": run_created_at_utc,
+                "provenance_json": serialized_provenance,
+            }
+            if existing is not None:
+                if any(existing[key] != value for key, value in expected.items()):
+                    connection.rollback()
+                    raise SessionIntegrityError(
+                        "LAB session id is already bound to different provenance"
+                    )
+                connection.commit()
+                return _lab_binding_from_row(existing)
+            if (
+                connection.execute(
+                    "SELECT 1 FROM observation_sessions WHERE session_id = ?",
+                    (session_id,),
+                ).fetchone()
+                is not None
+            ):
+                connection.rollback()
+                raise SessionIntegrityError("LAB session id already exists in the catalog")
+
+            connection.execute(
+                "INSERT INTO observation_sessions "
+                "(session_id, plugin_id, archive_id, display_name, status, "
+                "started_at_utc, completed_at_utc, duration_seconds, modalities_json, "
+                "replayable, origin, source_count, total_bytes, "
+                "primary_replay_artifact_id, timeline_origin_epoch_ns, "
+                "timeline_origin_monotonic_ns, allowed_root, session_root, "
+                "created_at_utc, updated_at_utc) "
+                "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+                (
+                    session_id,
+                    source["plugin_id"],
+                    LAB_ARCHIVE_ID,
+                    normalized_name,
+                    source["status"],
+                    run_created_at_utc,
+                    run_created_at_utc,
+                    source["duration_seconds"],
+                    source["modalities_json"],
+                    source["replayable"],
+                    LAB_ORIGIN,
+                    source["source_count"],
+                    source["total_bytes"],
+                    source["primary_replay_artifact_id"],
+                    source["timeline_origin_epoch_ns"],
+                    source["timeline_origin_monotonic_ns"],
+                    source["allowed_root"],
+                    source["session_root"],
+                    published_at,
+                    published_at,
+                ),
+            )
+            connection.execute(
+                "INSERT INTO observation_session_artifacts "
+                "(session_id, artifact_id, kind, media_type, byte_length, sha256, "
+                "integrity_status, locator, replay_byte_length) "
+                "SELECT ?, artifact_id, kind, media_type, byte_length, sha256, "
+                "integrity_status, locator, replay_byte_length "
+                "FROM observation_session_artifacts WHERE session_id = ?",
+                (session_id, source_session_id),
+            )
+            connection.execute(
+                "INSERT INTO observation_session_sources "
+                "(session_id, source_id, semantic_channel_id, modality, status, "
+                "seekable, artifact_id) "
+                "SELECT ?, source_id, semantic_channel_id, modality, status, "
+                "seekable, artifact_id FROM observation_session_sources "
+                "WHERE session_id = ?",
+                (session_id, source_session_id),
+            )
+            connection.execute(
+                "INSERT INTO observation_lab_instances "
+                "(session_id, source_session_id, lab_id, result_kind, result_id, "
+                "source_result_id, config_sha256, run_created_at_utc, "
+                "published_at_utc, provenance_json) "
+                "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+                (
+                    session_id,
+                    source_session_id,
+                    lab_id,
+                    result_kind,
+                    result_id,
+                    source_result_id,
+                    config_sha256,
+                    run_created_at_utc,
+                    published_at,
+                    serialized_provenance,
+                ),
+            )
+            connection.commit()
+        binding = self.get_lab_instance(session_id)
+        if binding is None:
+            raise SessionIntegrityError("LAB session publication was not durable")
+        return binding
 
     def delete_session(self, session_id: str) -> None:
         """Permanently delete one exact catalogued evidence directory and row."""
@@ -248,6 +492,29 @@ class SessionStore:
         _validate_identifier(session_id, "session id")
         with self._lock:
             with self._connect() as connection:
+                lab = connection.execute(
+                    "SELECT 1 FROM observation_lab_instances WHERE session_id = ?",
+                    (session_id,),
+                ).fetchone()
+                if lab is not None:
+                    connection.execute("BEGIN IMMEDIATE")
+                    deleted = connection.execute(
+                        "DELETE FROM observation_sessions WHERE session_id = ?",
+                        (session_id,),
+                    ).rowcount
+                    connection.commit()
+                    if deleted != 1:
+                        raise SessionNotFoundError("observation session was not found")
+                    return
+                dependent = connection.execute(
+                    "SELECT session_id FROM observation_lab_instances "
+                    "WHERE source_session_id = ? LIMIT 1",
+                    (session_id,),
+                ).fetchone()
+                if dependent is not None:
+                    raise SessionIntegrityError(
+                        "source session has LAB instances; remove those instances first"
+                    )
                 row = connection.execute(
                     "SELECT allowed_root, session_root FROM observation_sessions "
                     "WHERE session_id = ?",
@@ -737,7 +1004,11 @@ def _validate_candidate_replay(
         raise SessionIntegrityError("non-replayable observation declares replay artifacts")
 
 
-def _summary_from_row(row: sqlite3.Row) -> SessionSummary:
+def _summary_from_row(
+    row: sqlite3.Row,
+    *,
+    lab: LabSessionBinding | None = None,
+) -> SessionSummary:
     raw_modalities = json.loads(row["modalities_json"])
     modalities = tuple(cast(SessionModality, value) for value in raw_modalities)
     return SessionSummary(
@@ -752,9 +1023,58 @@ def _summary_from_row(row: sqlite3.Row) -> SessionSummary:
         total_bytes=row["total_bytes"],
         replayable=bool(row["replayable"]),
         origin=row["origin"],
+        lab=lab,
     )
 
 
+def _lab_binding_from_row(row: sqlite3.Row) -> LabSessionBinding:
+    try:
+        provenance = json.loads(row["provenance_json"])
+    except (TypeError, json.JSONDecodeError) as exc:
+        raise SessionIntegrityError("stored LAB provenance is invalid") from exc
+    if not isinstance(provenance, dict):
+        raise SessionIntegrityError("stored LAB provenance is not an object")
+    return LabSessionBinding(
+        session_id=row["session_id"],
+        source_session_id=row["source_session_id"],
+        lab_id=row["lab_id"],
+        result_kind=row["result_kind"],
+        result_id=row["result_id"],
+        source_result_id=row["source_result_id"],
+        config_sha256=row["config_sha256"],
+        run_created_at_utc=row["run_created_at_utc"],
+        published_at_utc=row["published_at_utc"],
+        provenance=provenance,
+    )
+
+
+def _serialize_provenance(value: dict[str, Any]) -> str:
+    try:
+        serialized = json.dumps(
+            value,
+            ensure_ascii=False,
+            sort_keys=True,
+            separators=(",", ":"),
+            allow_nan=False,
+        )
+    except (TypeError, ValueError) as exc:
+        raise ValueError("LAB provenance must be JSON-compatible") from exc
+    if len(serialized.encode("utf-8")) > 256 * 1024:
+        raise ValueError("LAB provenance exceeds 256 KiB")
+    return serialized
+
+
+def _require_utc_timestamp(value: str, field: str) -> None:
+    from datetime import datetime
+
+    try:
+        parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
+    except ValueError as exc:
+        raise ValueError(f"{field} is invalid") from exc
+    if parsed.tzinfo is None:
+        raise ValueError(f"{field} must include a timezone")
+
+
 def _layout_from_row(row: sqlite3.Row) -> WorkspaceLayout:
     payload = json.loads(row["layout_json"])
     if not isinstance(payload, dict):
diff --git a/src/k1link/web/session_api.py b/src/k1link/web/session_api.py
index 9131129..79a9b1c 100644
--- a/src/k1link/web/session_api.py
+++ b/src/k1link/web/session_api.py
@@ -327,6 +327,7 @@ def build_session_router(
                         "modalities": list(item.modalities),
                         "duration_seconds": item.duration_seconds or 0.0,
                         "replayable": item.replayable,
+                        **({"lab": item.lab.as_dict()} if item.lab is not None else {}),
                         **(
                             {
                                 "preparation": _catalog_preparation_document(
@@ -410,9 +411,8 @@ def build_session_router(
                     detail="Запись сейчас открыта в интерфейсе. Закройте её и повторите удаление.",
                 )
 
-        if (
-            recording_preparation_manager is not None
-            and not recording_preparation_manager.discard(session_id)
+        if recording_preparation_manager is not None and not recording_preparation_manager.discard(
+            session_id
         ):
             raise HTTPException(
                 status_code=409,
@@ -960,10 +960,7 @@ def build_session_router(
             },
         )
 
-    @router.get(
-        "/api/v1/observation-sessions/{session_id}/perception-media/"
-        "{result_id}/manifest"
-    )
+    @router.get("/api/v1/observation-sessions/{session_id}/perception-media/{result_id}/manifest")
     def get_recorded_perception_media_manifest(
         session_id: str,
         result_id: str,
@@ -988,8 +985,7 @@ def build_session_router(
         )
 
     @router.api_route(
-        "/api/v1/observation-sessions/{session_id}/perception-media/"
-        "{result_id}/recording.mp4",
+        "/api/v1/observation-sessions/{session_id}/perception-media/{result_id}/recording.mp4",
         methods=["GET", "HEAD"],
     )
     def stream_recorded_perception_media(
@@ -1593,10 +1589,7 @@ def _recorded_perception_manifest_document(
 ) -> dict[str, Any]:
     encoded_session_id = quote(video.session_id, safe="")
     encoded_result_id = quote(video.result_id, safe="")
-    base = (
-        f"/api/v1/observation-sessions/{encoded_session_id}/perception-media/"
-        f"{encoded_result_id}"
-    )
+    base = f"/api/v1/observation-sessions/{encoded_session_id}/perception-media/{encoded_result_id}"
     return {
         "schema_version": RECORDED_MEDIA_STREAM_MANIFEST_SCHEMA,
         "source_id": video.public_source_id,
@@ -1835,9 +1828,7 @@ def _recorded_media_epoch_response(
     if len(matches) != 1:
         raise HTTPException(status_code=404, detail="Эпоха записанного медиаканала не найдена.")
     epoch = matches[0]
-    byte_length = epoch.init_byte_length + sum(
-        segment.byte_length for segment in epoch.segments
-    )
+    byte_length = epoch.init_byte_length + sum(segment.byte_length for segment in epoch.segments)
     start, end = (0, byte_length - 1)
     status_code = 200
     if range_header is not None:
@@ -1851,9 +1842,7 @@ def _recorded_media_epoch_response(
         "ETag": etag,
         "Content-Length": str(end - start + 1),
         "X-Content-Type-Options": "nosniff",
-        "Content-Disposition": (
-            f'inline; filename="recorded-camera-{epoch.ordinal}.mp4"'
-        ),
+        "Content-Disposition": (f'inline; filename="recorded-camera-{epoch.ordinal}.mp4"'),
     }
     if status_code == 206:
         headers["Content-Range"] = f"bytes {start}-{end}/{byte_length}"
diff --git a/tests/test_session_api.py b/tests/test_session_api.py
index 68de392..eabf247 100644
--- a/tests/test_session_api.py
+++ b/tests/test_session_api.py
@@ -265,6 +265,39 @@ def test_session_router_lists_details_and_dispatches_opaque_replay(tmp_path: Pat
         assert_no_local_paths(value, repository)
 
 
+def test_session_router_exposes_immutable_lab_provenance(tmp_path: Path) -> None:
+    repository = tmp_path / "repo"
+    sessions = repository / "sessions"
+    source = make_legacy_session(sessions, "20260716T205632Z_viewer_live")
+    store = SessionStore(repository, data_dir=tmp_path / "data")
+    store.reconcile_archive(xgrids_k1_archive_source(sessions))
+    binding = store.publish_lab_instance(
+        session_id="lab-e21-d0201712",
+        source_session_id=source.name,
+        display_name="LAB E21 · Real-time 1× · d0201712",
+        lab_id="LAB E21",
+        result_kind="e21-realtime-envelope",
+        result_id="e10-integrated-perception-" + "a" * 64,
+        source_result_id="e21-realtime-envelope-" + "b" * 64,
+        config_sha256="c" * 64,
+        run_created_at_utc="2026-07-23T15:55:15.548Z",
+        provenance={"source_payloads_mutated": False},
+    )
+    router = build_session_router(store)
+    list_route = endpoint(router, "/api/v1/observation-sessions", "GET")
+    detail_route = endpoint(router, "/api/v1/observation-sessions/{session_id}", "GET")
+
+    listing = list_route(limit=20, cursor=None)
+    item = next(value for value in listing["items"] if value["id"] == binding.session_id)
+    detail = detail_route(session_id=binding.session_id)
+
+    assert item["lab"] == binding.as_dict()
+    assert detail["lab"] == binding.as_dict()
+    assert item["lab"]["source_session_id"] == source.name
+    assert item["lab"]["provenance"]["source_payloads_mutated"] is False
+    assert_no_local_paths((item, detail), repository)
+
+
 def test_delete_session_removes_evidence_and_cache_but_refuses_an_open_recording(
     tmp_path: Path,
 ) -> None:
diff --git a/tests/test_session_lab_cache.py b/tests/test_session_lab_cache.py
new file mode 100644
index 0000000..f525c33
--- /dev/null
+++ b/tests/test_session_lab_cache.py
@@ -0,0 +1,89 @@
+from __future__ import annotations
+
+import hashlib
+import json
+from pathlib import Path
+
+from k1link.sessions.lab_cache import publish_lab_replay_cache
+from k1link.sessions.recording import (
+    CACHE_SCHEMA,
+    RECORDING_CACHE_FILENAME,
+    RECORDING_CACHE_SIDECAR_FILENAME,
+)
+
+
+def canonical_json(value: object) -> bytes:
+    return json.dumps(
+        value,
+        ensure_ascii=False,
+        sort_keys=True,
+        separators=(",", ":"),
+        allow_nan=False,
+    ).encode()
+
+
+def test_publish_lab_replay_cache_hardlinks_rrd_and_rebinds_sidecars(
+    tmp_path: Path,
+) -> None:
+    data = tmp_path / "mission-core"
+    recordings = data / "recordings"
+    source = recordings / "source-session"
+    source.mkdir(parents=True)
+    source_rrd = source / RECORDING_CACHE_FILENAME
+    source_rrd.write_bytes(b"RRF2immutable")
+    source_sidecar = {
+        "schema_version": CACHE_SCHEMA,
+        "session_id": source.name,
+        "recording_byte_length": source_rrd.stat().st_size,
+        "recording_mtime_ns": source_rrd.stat().st_mtime_ns,
+        "recording_sha256": hashlib.sha256(source_rrd.read_bytes()).hexdigest(),
+    }
+    (source / RECORDING_CACHE_SIDECAR_FILENAME).write_text(
+        json.dumps(source_sidecar),
+        encoding="utf-8",
+    )
+    media_root = data / "recorded-media-preparations"
+    media_root.mkdir()
+    media_body = {
+        "schema_version": "missioncore.recorded-media-preparation/v1",
+        "session_id": source.name,
+        "artifact_id": "recorded-video-1",
+        "generation": "accepted",
+    }
+    (media_root / "source.json").write_text(
+        json.dumps(
+            {
+                **media_body,
+                "checksum_sha256": hashlib.sha256(canonical_json(media_body)).hexdigest(),
+            }
+        ),
+        encoding="utf-8",
+    )
+
+    publish_lab_replay_cache(
+        data,
+        source_session_id=source.name,
+        lab_session_id="lab-e21-result",
+    )
+
+    lab = recordings / "lab-e21-result"
+    lab_rrd = lab / RECORDING_CACHE_FILENAME
+    assert lab_rrd.read_bytes() == source_rrd.read_bytes()
+    assert lab_rrd.stat().st_ino == source_rrd.stat().st_ino
+    assert lab_rrd.stat().st_nlink == 2
+    cloned_cache = json.loads(
+        (lab / RECORDING_CACHE_SIDECAR_FILENAME).read_text(encoding="utf-8")
+    )
+    assert cloned_cache["session_id"] == "lab-e21-result"
+    cloned_media = [
+        json.loads(path.read_text(encoding="utf-8"))
+        for path in media_root.iterdir()
+        if path.name != "source.json"
+    ]
+    assert len(cloned_media) == 1
+    assert cloned_media[0]["session_id"] == "lab-e21-result"
+    cloned_checksum = cloned_media[0].pop("checksum_sha256")
+    assert cloned_checksum == hashlib.sha256(canonical_json(cloned_media[0])).hexdigest()
+
+    lab_rrd.unlink()
+    assert source_rrd.read_bytes() == b"RRF2immutable"
diff --git a/tests/test_session_store.py b/tests/test_session_store.py
index 0dced5b..e1f83af 100644
--- a/tests/test_session_store.py
+++ b/tests/test_session_store.py
@@ -777,6 +777,78 @@ def test_delete_session_removes_only_the_exact_evidence_tree_and_catalog_row(
     assert store.get_session(retained.name).summary.session_id == retained.name
 
 
+def test_lab_instance_is_independent_and_never_deletes_source_evidence(
+    tmp_path: Path,
+) -> None:
+    repository = tmp_path / "repo"
+    sessions = repository / "sessions"
+    source = make_legacy_session(sessions, "20260716T205632Z_viewer_live")
+    store = SessionStore(repository, data_dir=tmp_path / "data")
+    archive = xgrids_k1_archive_source(sessions)
+    store.reconcile_archive(archive)
+    source_command = store.prepare_replay(source.name)
+
+    binding = store.publish_lab_instance(
+        session_id="lab-e21-d0201712",
+        source_session_id=source.name,
+        display_name="LAB E21 · RT 1× · d0201712",
+        lab_id="LAB E21",
+        result_kind="e10-integrated-perception",
+        result_id="e10-integrated-perception-" + "a" * 64,
+        source_result_id="e21-realtime-envelope-" + "b" * 64,
+        config_sha256="c" * 64,
+        run_created_at_utc="2026-07-23T15:51:25.000Z",
+        provenance={"storage_mode": "hard-linked-immutable-payloads"},
+    )
+
+    detail = store.get_session(binding.session_id)
+    lab_command = store.prepare_replay(binding.session_id)
+    assert detail.summary.lab == binding
+    assert detail.summary.display_name == "LAB E21 · RT 1× · d0201712"
+    assert lab_command.primary_artifact.path == source_command.primary_artifact.path
+    assert lab_command.session_id == binding.session_id
+    assert source.is_dir()
+
+    with pytest.raises(SessionIntegrityError, match="has LAB instances"):
+        store.delete_session(source.name)
+    assert source.is_dir()
+
+    store.delete_session(binding.session_id)
+    assert source.is_dir()
+    assert store.get_session(source.name).summary.lab is None
+    with pytest.raises(SessionNotFoundError):
+        store.get_session(binding.session_id)
+
+
+def test_lab_instance_publication_is_idempotent_but_provenance_is_immutable(
+    tmp_path: Path,
+) -> None:
+    repository = tmp_path / "repo"
+    sessions = repository / "sessions"
+    source = make_legacy_session(sessions, "20260716T205632Z_viewer_live")
+    store = SessionStore(repository, data_dir=tmp_path / "data")
+    store.reconcile_archive(xgrids_k1_archive_source(sessions))
+    parameters = {
+        "session_id": "lab-e19-36964643",
+        "source_session_id": source.name,
+        "display_name": "LAB E19 · Ground-aware 3D",
+        "lab_id": "LAB E19",
+        "result_kind": "e10-integrated-perception",
+        "result_id": "e10-integrated-perception-" + "d" * 64,
+        "source_result_id": "e10-integrated-perception-" + "e" * 64,
+        "config_sha256": "f" * 64,
+        "run_created_at_utc": "2026-07-23T05:19:43.138Z",
+        "provenance": {"source": "accepted"},
+    }
+
+    first = store.publish_lab_instance(**parameters)
+    second = store.publish_lab_instance(**parameters)
+    assert second == first
+
+    with pytest.raises(SessionIntegrityError, match="different provenance"):
+        store.publish_lab_instance(**{**parameters, "config_sha256": "0" * 64})
+
+
 def test_delete_session_rejects_a_catalog_target_outside_its_allowed_root(
     tmp_path: Path,
 ) -> None: