refactor(lab): restore canonical RAV004 replay

src/k1link/web/app.py

@@ -360,6 +360,15 @@ def _m48_recorded_camera_playback_source(
     return session_recorded_camera_frame_service.playback_source(session_id)
 
 
+def _canonical_lab_recording_source(session_id: str) -> tuple[Path, str] | None:
+    """Resolve one already-published immutable RRD without starting new work."""
+
+    snapshot = session_recording_preparation_manager.status(session_id)
+    if snapshot is None or snapshot.state != "ready" or snapshot.recording is None:
+        return None
+    return snapshot.recording.path, snapshot.recording.sha256
+
+
 def refresh_observation_catalog() -> tuple[str, ...]:
     """Discover completed or recoverable local evidence without copying payloads."""
 
@@ -1032,6 +1041,12 @@ app.include_router(
             / "lab-v1-vegetation"
             / "results"
         ),
+        canonical_recording_provider=_canonical_lab_recording_source,
+        camera_frame_provider=(
+            session_recorded_camera_frame_service.extract
+            if session_recorded_camera_frame_service is not None
+            else None
+        ),
     )
 )
 app.include_router(