fix(lab): stabilize recorded spatial playback

tests/test_m4_threat_replay_result.py

@@ -130,6 +130,9 @@ def test_m4_6_timeline_is_indexed_and_spatial_evidence_is_chunked() -> None:
     assert timeline["frame_count"] == 4489
     assert len(timeline["frame_times_ns"]) == 4489
     assert timeline["recorded_source"]["session_id"] == "20260720T065719Z_viewer_live"
+    assert timeline["recorded_source"]["representation_id"] == "registered-map-increment-v1"
+    assert timeline["point_delivery"] == "exact-current-increment"
+    assert timeline["maximum_source_points_per_frame"] == 3092
     assert "frames" not in timeline
 
     chunk = get_chunk(RESULT_ID, start=1880, count=12)
@@ -141,7 +144,8 @@ def test_m4_6_timeline_is_indexed_and_spatial_evidence_is_chunked() -> None:
     assert first["schema_version"] == "missioncore.recorded-spatial-evidence-frame/v1"
     assert first["spatial_available"] is True
     assert first["point_cloud_layer"] == "current-increment"
-    assert 0 < first["point_cloud_sample_count"] <= 2000
+    assert first["point_cloud_sample_count"] == first["point_cloud_source_count"]
+    assert 0 < first["point_cloud_sample_count"] <= 4096
     assert first["camera_url"].endswith(f"/{RESULT_ID}/timeline/frames/1880/camera")