diff --git a/config/deployment/mission-core-worker-shadow-v1.template.json b/config/deployment/mission-core-worker-shadow-v1.template.json
index 18c83c9..9769a5d 100644
--- a/config/deployment/mission-core-worker-shadow-v1.template.json
+++ b/config/deployment/mission-core-worker-shadow-v1.template.json
@@ -139,7 +139,7 @@
     },
     "wheel": {
       "name": "nodedc_mission_core-0.1.0-py3-none-any.whl",
-      "sha256": "df756938f2c212fb6d1770c83569e5366c708d70d74e0434895a21be55a16102"
+      "sha256": "4158784fd40b70c7213b629ed39d664fd2f12eab1c9242ec9a6ebbb366e3dd5a"
     }
   },
   "rollback": {
diff --git a/config/perception/m4-reuse-inventory-v1.json b/config/perception/m4-reuse-inventory-v1.json
index 07b9765..93d2805 100644
--- a/config/perception/m4-reuse-inventory-v1.json
+++ b/config/perception/m4-reuse-inventory-v1.json
@@ -28,9 +28,9 @@
       "admission": "reuse"
     },
     {
-      "module": "k1link.compute.yolox_object_detector",
-      "role": "frozen source-neutral YOLOX preprocess, Triton transport and postprocess",
-      "admission": "adapt-behind-provider"
+      "module": "k1link.perception.yolox_object_detector",
+      "role": "product-owned frozen YOLOX preprocess, Triton transport and postprocess",
+      "admission": "product-owned"
     }
   ],
   "historical_wrappers": [
diff --git a/docs/22_MILESTONE_4_OBJECT_CENTRIC_RECORDED_REALTIME_CV.md b/docs/22_MILESTONE_4_OBJECT_CENTRIC_RECORDED_REALTIME_CV.md
index 25087b6..d04ef9e 100644
--- a/docs/22_MILESTONE_4_OBJECT_CENTRIC_RECORDED_REALTIME_CV.md
+++ b/docs/22_MILESTONE_4_OBJECT_CENTRIC_RECORDED_REALTIME_CV.md
@@ -686,7 +686,7 @@ duplicate development server or Worker 006 mutation was introduced.
 The product detector seam is implemented without importing the immutable E46J
 wrapper:
 
-- `k1link.compute.yolox_object_detector` contains only the frozen raw-KB4
+- `k1link.perception.yolox_object_detector` contains only the frozen raw-KB4
   valid-FOV fill, top-left bilinear letterbox, Triton V2 binary HTTP transport,
   standard YOLOX decode, fixed score/class-wise NMS and FOV/box validation;
 - `k1link.perception.detector.FrozenYoloxDetectorProvider` turns exactly one
diff --git a/scripts/build_m4_worker_shadow_artifact.py b/scripts/build_m4_worker_shadow_artifact.py
index 174b63b..4d91376 100644
--- a/scripts/build_m4_worker_shadow_artifact.py
+++ b/scripts/build_m4_worker_shadow_artifact.py
@@ -25,7 +25,7 @@ WHEEL_NAME = "nodedc_mission_core-0.1.0-py3-none-any.whl"
 RUNNER_NAME = RUNNER.name
 PATCH_ID = re.compile(r"^[A-Za-z0-9._-]{1,96}$")
 EXPECTED_BASELINE_SHA256 = "ea10359339e6cce31b5780a2710299771cab7cc0c1c2a2b56a1621f786b31fa8"
-EXPECTED_WHEEL_SHA256 = "df756938f2c212fb6d1770c83569e5366c708d70d74e0434895a21be55a16102"
+EXPECTED_WHEEL_SHA256 = "4158784fd40b70c7213b629ed39d664fd2f12eab1c9242ec9a6ebbb366e3dd5a"
 PAYLOAD_FILES = (
     RUNNER_NAME,
     WHEEL_NAME,
diff --git a/src/k1link/perception/__init__.py b/src/k1link/perception/__init__.py
index 7d58a38..8dc0815 100644
--- a/src/k1link/perception/__init__.py
+++ b/src/k1link/perception/__init__.py
@@ -1,213 +1,6 @@
-"""Object-centric, source-neutral Mission Core perception product boundary."""
+"""Object-centric, source-neutral Mission Core perception product boundary.
 
-from .adapters import (
-    PerceptionAdapterError,
-    observations_from_track_geometry,
-    temporal_obstacles_from_e34_projection,
-)
-from .baseline import (
-    BASELINE_PROFILE_ID,
-    BASELINE_SCHEMA,
-    BaselineContractError,
-    BaselineProfile,
-    BaselineVerification,
-    load_m4_baseline,
-    validate_reuse_inventory,
-    verify_m4_baseline,
-    verify_m4_execution_source,
-)
-from .contracts import (
-    LOCAL_OBSTACLE_MAP_SCHEMA,
-    OBJECT_PROPOSAL_SCHEMA,
-    OBSTACLE_OBSERVATION_SCHEMA,
-    SOURCE_ENVELOPE_SCHEMA,
-    TEMPORAL_OBSTACLE_SCHEMA,
-    THREAT_ASSESSMENT_SCHEMA,
-    BoundingRegion2D,
-    ClockBasis,
-    CorridorIntersection,
-    EvidenceBasis,
-    EvidenceCurrentness,
-    FalseAuthority,
-    GridCell,
-    HistorySample,
-    LocalObstacleMap,
-    MetricGeometry,
-    ModalityOutcome,
-    ModalityStatus,
-    MotionState,
-    ObjectProposal2D,
-    ObstacleObservation,
-    PerceptionContractError,
-    QualificationState,
-    SourceAccounting,
-    SourceEnvelope,
-    TemporalObstacle,
-    TemporalState,
-    ThreatAssessment,
-    ThreatAuthority,
-    ThreatDecision,
-    TimestampBundle,
-    validate_exclusive_point_ownership,
-)
-from .detector import (
-    FROZEN_YOLOX_MODEL_ID,
-    FROZEN_YOLOX_PREPROCESS_ID,
-    FROZEN_YOLOX_PROVIDER_ID,
-    DetectorProviderError,
-    DetectorProviderSnapshot,
-    FrozenYoloxDetectorProvider,
-    proposals_from_detections,
-)
-from .detector_replay import run_detector_replay
-from .detector_replay_result import (
-    DETECTOR_REPLAY_FRAME_SCHEMA,
-    DETECTOR_REPLAY_RESULT_SCHEMA,
-    DETECTOR_RUNTIME_IDENTITY_SCHEMA,
-    M4_DETECTOR_REPLAY_GATE,
-    DetectorReplayFrame,
-    DetectorReplayGate,
-    DetectorReplayMetrics,
-    DetectorReplayResult,
-    DetectorReplayResultError,
-    DetectorRuntimeIdentity,
-    read_detector_replay_result,
-    require_m4_detector_replay_acceptance,
-)
-from .graph import (
-    GRAPH_RESULT_SCHEMA,
-    REFERENCE_GRAPH_ID,
-    TERMINAL_OUTCOME_SCHEMA,
-    DeliveredFrame,
-    GraphExecutionError,
-    GraphRunResult,
-    GraphState,
-    ReferencePerceptionGraphV1,
-    TerminalOutcome,
-    TerminalOutcomeType,
-)
-from .providers import (
-    REFERENCE_GRAPH_CONFIG_SCHEMA,
-    DetectorProvider,
-    GeometryAssociationProvider,
-    GraphAuthority,
-    MotionProvider,
-    ProviderContractError,
-    ProviderPin,
-    ProviderRole,
-    QueuePolicy,
-    ReferencePerceptionGraphConfig,
-    SourcePacket,
-    SourceProvider,
-    TemporalStateProvider,
-    ThreatProvider,
-)
-from .recorded_source import (
-    DecodedRecordedSource,
-    LiveSourceAdapter,
-    PyAvRecordedImageDecoder,
-    RecordedFrameReference,
-    RecordedImageDecoder,
-    RecordedRavnoves00Source,
-    RecordedSourceError,
-    ReplayPacing,
-)
-
-__all__ = [
-    "BASELINE_PROFILE_ID",
-    "BASELINE_SCHEMA",
-    "BaselineContractError",
-    "BaselineProfile",
-    "BaselineVerification",
-    "load_m4_baseline",
-    "validate_reuse_inventory",
-    "verify_m4_execution_source",
-    "verify_m4_baseline",
-    "PerceptionAdapterError",
-    "observations_from_track_geometry",
-    "temporal_obstacles_from_e34_projection",
-    "LOCAL_OBSTACLE_MAP_SCHEMA",
-    "OBJECT_PROPOSAL_SCHEMA",
-    "OBSTACLE_OBSERVATION_SCHEMA",
-    "SOURCE_ENVELOPE_SCHEMA",
-    "TEMPORAL_OBSTACLE_SCHEMA",
-    "THREAT_ASSESSMENT_SCHEMA",
-    "BoundingRegion2D",
-    "ClockBasis",
-    "CorridorIntersection",
-    "EvidenceBasis",
-    "EvidenceCurrentness",
-    "FalseAuthority",
-    "GridCell",
-    "HistorySample",
-    "LocalObstacleMap",
-    "MetricGeometry",
-    "ModalityOutcome",
-    "ModalityStatus",
-    "MotionState",
-    "ObjectProposal2D",
-    "ObstacleObservation",
-    "PerceptionContractError",
-    "QualificationState",
-    "SourceAccounting",
-    "SourceEnvelope",
-    "TemporalObstacle",
-    "TemporalState",
-    "ThreatAssessment",
-    "ThreatAuthority",
-    "ThreatDecision",
-    "TimestampBundle",
-    "validate_exclusive_point_ownership",
-    "FROZEN_YOLOX_MODEL_ID",
-    "FROZEN_YOLOX_PREPROCESS_ID",
-    "FROZEN_YOLOX_PROVIDER_ID",
-    "DetectorProviderError",
-    "DetectorProviderSnapshot",
-    "FrozenYoloxDetectorProvider",
-    "proposals_from_detections",
-    "DETECTOR_REPLAY_FRAME_SCHEMA",
-    "DETECTOR_REPLAY_RESULT_SCHEMA",
-    "DETECTOR_RUNTIME_IDENTITY_SCHEMA",
-    "M4_DETECTOR_REPLAY_GATE",
-    "DetectorReplayFrame",
-    "DetectorReplayGate",
-    "DetectorReplayMetrics",
-    "DetectorReplayResult",
-    "DetectorReplayResultError",
-    "DetectorRuntimeIdentity",
-    "read_detector_replay_result",
-    "require_m4_detector_replay_acceptance",
-    "run_detector_replay",
-    "REFERENCE_GRAPH_CONFIG_SCHEMA",
-    "DetectorProvider",
-    "GeometryAssociationProvider",
-    "GraphAuthority",
-    "MotionProvider",
-    "ProviderContractError",
-    "ProviderPin",
-    "ProviderRole",
-    "QueuePolicy",
-    "ReferencePerceptionGraphConfig",
-    "SourcePacket",
-    "SourceProvider",
-    "TemporalStateProvider",
-    "ThreatProvider",
-    "GRAPH_RESULT_SCHEMA",
-    "REFERENCE_GRAPH_ID",
-    "TERMINAL_OUTCOME_SCHEMA",
-    "DeliveredFrame",
-    "GraphExecutionError",
-    "GraphRunResult",
-    "GraphState",
-    "ReferencePerceptionGraphV1",
-    "TerminalOutcome",
-    "TerminalOutcomeType",
-    "LiveSourceAdapter",
-    "DecodedRecordedSource",
-    "PyAvRecordedImageDecoder",
-    "RecordedFrameReference",
-    "RecordedImageDecoder",
-    "RecordedRavnoves00Source",
-    "RecordedSourceError",
-    "ReplayPacing",
-]
+The package initializer is deliberately side-effect free. Runtime code imports
+the concrete contract, provider, graph or source module it needs; importing the
+product namespace must not initialize legacy compute, device, web or MQTT code.
+"""
diff --git a/src/k1link/perception/detector.py b/src/k1link/perception/detector.py
index cac7202..bf82271 100644
--- a/src/k1link/perception/detector.py
+++ b/src/k1link/perception/detector.py
@@ -12,7 +12,9 @@ from typing import Final
 import numpy as np
 from numpy.typing import NDArray
 
-from k1link.compute.yolox_object_detector import (
+from .contracts import BoundingRegion2D, ObjectProposal2D
+from .providers import SourcePacket
+from .yolox_object_detector import (
     FROZEN_YOLOX_CONFIG,
     YOLOX_MODEL_ID,
     YOLOX_MODEL_VERSION,
@@ -24,9 +26,6 @@ from k1link.compute.yolox_object_detector import (
     preprocess_raw_kb4,
 )
 
-from .contracts import BoundingRegion2D, ObjectProposal2D
-from .providers import SourcePacket
-
 FROZEN_YOLOX_PROVIDER_ID: Final = "triton-yolox-s-raw-kb4/v1"
 FROZEN_YOLOX_MODEL_ID: Final = f"{YOLOX_MODEL_ID}:{YOLOX_MODEL_VERSION}"
 FROZEN_YOLOX_PREPROCESS_ID: Final = "raw-kb4-valid-fov-letterbox/v1"
diff --git a/src/k1link/perception/detector_replay_cli.py b/src/k1link/perception/detector_replay_cli.py
index 460b535..4e235d0 100644
--- a/src/k1link/perception/detector_replay_cli.py
+++ b/src/k1link/perception/detector_replay_cli.py
@@ -9,11 +9,6 @@ import urllib.parse
 from pathlib import Path
 from threading import Event
 
-from k1link.compute.yolox_object_detector import (
-    TritonHttpInferenceBackend,
-    load_valid_fov_mask,
-)
-
 from .baseline import load_m4_baseline, verify_m4_execution_source
 from .detector import FrozenYoloxDetectorProvider
 from .detector_replay import run_detector_replay
@@ -28,6 +23,10 @@ from .recorded_source import (
     RecordedRavnoves00Source,
     ReplayPacing,
 )
+from .yolox_object_detector import (
+    TritonHttpInferenceBackend,
+    load_valid_fov_mask,
+)
 
 
 def _arguments() -> argparse.Namespace:
diff --git a/src/k1link/perception/detector_replay_contracts.py b/src/k1link/perception/detector_replay_contracts.py
index c098bba..6f85f21 100644
--- a/src/k1link/perception/detector_replay_contracts.py
+++ b/src/k1link/perception/detector_replay_contracts.py
@@ -8,12 +8,6 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Final
 
-from k1link.compute.yolox_object_detector import (
-    YOLOX_CONFIG_SHA256,
-    YOLOX_MODEL_SHA256,
-    YOLOX_VALID_FOV_SHA256,
-)
-
 from .contracts import ObjectProposal2D, SourceEnvelope
 from .detector import (
     FROZEN_YOLOX_MODEL_ID,
@@ -21,6 +15,11 @@ from .detector import (
     FROZEN_YOLOX_PROVIDER_ID,
     DetectorProviderSnapshot,
 )
+from .yolox_object_detector import (
+    YOLOX_CONFIG_SHA256,
+    YOLOX_MODEL_SHA256,
+    YOLOX_VALID_FOV_SHA256,
+)
 
 DETECTOR_REPLAY_RESULT_SCHEMA: Final = "missioncore.perception-detector-replay-result/v1"
 DETECTOR_REPLAY_RECEIPT_SCHEMA: Final = "missioncore.perception-detector-replay-receipt/v1"
diff --git a/src/k1link/perception/detector_replay_result.py b/src/k1link/perception/detector_replay_result.py
index 4c3f7fb..893a3b0 100644
--- a/src/k1link/perception/detector_replay_result.py
+++ b/src/k1link/perception/detector_replay_result.py
@@ -10,14 +10,6 @@ import uuid
 from datetime import UTC, datetime
 from pathlib import Path
 
-from k1link.compute.yolox_object_detector import (
-    FROZEN_YOLOX_CONFIG,
-    YOLOX_CONFIG_SHA256,
-    YOLOX_MODEL_SHA256,
-    YOLOX_MODEL_VERSION,
-    YOLOX_VALID_FOV_SHA256,
-)
-
 from .baseline import (
     BASELINE_CAMERA_STREAM_SHA256,
     BASELINE_FILE_SHA256,
@@ -57,6 +49,13 @@ from .detector_replay_validation import (
 )
 from .detector_replay_validation import validate_frame_accounting
 from .recorded_source import RECORDED_SOURCE_PROVIDER_ID
+from .yolox_object_detector import (
+    FROZEN_YOLOX_CONFIG,
+    YOLOX_CONFIG_SHA256,
+    YOLOX_MODEL_SHA256,
+    YOLOX_MODEL_VERSION,
+    YOLOX_VALID_FOV_SHA256,
+)
 
 
 def seal_detector_replay_result(
diff --git a/src/k1link/perception/detector_replay_validation.py b/src/k1link/perception/detector_replay_validation.py
index ab1099b..f886a33 100644
--- a/src/k1link/perception/detector_replay_validation.py
+++ b/src/k1link/perception/detector_replay_validation.py
@@ -6,14 +6,6 @@ import hashlib
 import json
 from pathlib import Path
 
-from k1link.compute.yolox_object_detector import (
-    FROZEN_YOLOX_CONFIG,
-    YOLOX_CONFIG_SHA256,
-    YOLOX_MODEL_SHA256,
-    YOLOX_MODEL_VERSION,
-    YOLOX_VALID_FOV_SHA256,
-)
-
 from .baseline import (
     BASELINE_CAMERA_STREAM_SHA256,
     BASELINE_FILE_SHA256,
@@ -53,6 +45,13 @@ from .detector_replay_contracts import (
     detector_replay_accepted,
 )
 from .recorded_source import RECORDED_SOURCE_PROVIDER_ID
+from .yolox_object_detector import (
+    FROZEN_YOLOX_CONFIG,
+    YOLOX_CONFIG_SHA256,
+    YOLOX_MODEL_SHA256,
+    YOLOX_MODEL_VERSION,
+    YOLOX_VALID_FOV_SHA256,
+)
 
 
 def read_detector_replay_result(root: Path) -> DetectorReplayResult:
diff --git a/src/k1link/compute/yolox_object_detector.py b/src/k1link/perception/yolox_object_detector.py
similarity index 99%
rename from src/k1link/compute/yolox_object_detector.py
rename to src/k1link/perception/yolox_object_detector.py
index 5b338b8..4dbc5b8 100644
--- a/src/k1link/compute/yolox_object_detector.py
+++ b/src/k1link/perception/yolox_object_detector.py
@@ -1,4 +1,4 @@
-"""Source-neutral frozen YOLOX preprocessing, inference transport and postprocessing."""
+"""Perception-owned frozen YOLOX preprocessing, transport and postprocessing."""
 
 from __future__ import annotations
 
diff --git a/tests/test_detector_replay.py b/tests/test_detector_replay.py
index 9521eb0..cac6982 100644
--- a/tests/test_detector_replay.py
+++ b/tests/test_detector_replay.py
@@ -11,11 +11,6 @@ import numpy as np
 import pytest
 from numpy.typing import NDArray
 
-from k1link.compute.yolox_object_detector import (
-    YOLOX_CONFIG_SHA256,
-    YOLOX_MODEL_SHA256,
-    YOLOX_VALID_FOV_SHA256,
-)
 from k1link.perception.contracts import (
     ClockBasis,
     ModalityOutcome,
@@ -34,6 +29,11 @@ from k1link.perception.detector_replay_result import (
     require_m4_detector_replay_acceptance,
 )
 from k1link.perception.providers import SourcePacket
+from k1link.perception.yolox_object_detector import (
+    YOLOX_CONFIG_SHA256,
+    YOLOX_MODEL_SHA256,
+    YOLOX_VALID_FOV_SHA256,
+)
 
 
 class _Source:
diff --git a/tests/test_perception_architecture.py b/tests/test_perception_architecture.py
index 3820b10..6d3657b 100644
--- a/tests/test_perception_architecture.py
+++ b/tests/test_perception_architecture.py
@@ -19,6 +19,20 @@ REPOSITORY_ROOT = Path(__file__).resolve().parents[1]
 PERCEPTION_ROOT = REPOSITORY_ROOT / "src" / "k1link" / "perception"
 BASELINE_PATH = REPOSITORY_ROOT / "config" / "perception" / "m4-recorded-realtime-baseline-v1.json"
 REUSE_PATH = REPOSITORY_ROOT / "config" / "perception" / "m4-reuse-inventory-v1.json"
+DETECTOR_RUNTIME_MODULES = (
+    "__init__.py",
+    "baseline.py",
+    "contracts.py",
+    "detector.py",
+    "detector_replay.py",
+    "detector_replay_cli.py",
+    "detector_replay_contracts.py",
+    "detector_replay_result.py",
+    "detector_replay_validation.py",
+    "providers.py",
+    "recorded_source.py",
+    "yolox_object_detector.py",
+)
 
 
 def _imports(path: Path) -> set[str]:
@@ -151,6 +165,22 @@ def test_perception_contracts_import_no_compute_lab_graph_or_web_module() -> Non
     assert forbidden == set()
 
 
+def test_perception_package_initializer_is_side_effect_free() -> None:
+    assert _imports(PERCEPTION_ROOT / "__init__.py") == set()
+
+
+def test_detector_runtime_closure_imports_no_legacy_compute_package() -> None:
+    violations = {
+        name: sorted(
+            module
+            for module in _imports(PERCEPTION_ROOT / name)
+            if module.startswith("k1link.compute")
+        )
+        for name in DETECTOR_RUNTIME_MODULES
+    }
+    assert {name: modules for name, modules in violations.items() if modules} == {}
+
+
 def test_new_perception_boundary_has_no_experiment_specific_imports() -> None:
     violations: dict[str, str] = {}
     for path in PERCEPTION_ROOT.glob("*.py"):
diff --git a/tests/test_yolox_detector_provider.py b/tests/test_yolox_detector_provider.py
index d492d5b..515df1c 100644
--- a/tests/test_yolox_detector_provider.py
+++ b/tests/test_yolox_detector_provider.py
@@ -9,14 +9,6 @@ import numpy as np
 import pytest
 from numpy.typing import NDArray
 
-from k1link.compute.yolox_object_detector import (
-    FrozenYoloxConfig,
-    TritonHttpInferenceBackend,
-    YoloxDetection,
-    YoloxDetectorError,
-    postprocess_yolox,
-    preprocess_raw_kb4,
-)
 from k1link.perception.contracts import (
     ClockBasis,
     ModalityOutcome,
@@ -31,6 +23,14 @@ from k1link.perception.detector import (
     proposals_from_detections,
 )
 from k1link.perception.providers import SourcePacket
+from k1link.perception.yolox_object_detector import (
+    FrozenYoloxConfig,
+    TritonHttpInferenceBackend,
+    YoloxDetection,
+    YoloxDetectorError,
+    postprocess_yolox,
+    preprocess_raw_kb4,
+)
 
 REPOSITORY_ROOT = Path(__file__).resolve().parents[1]
 E46J_FRAMES = (