[AZ-895] Deprecate replay auto-sync surface; file AZ-908 follow-up

Option A (minimum-deprecation, 2 SP) per user complexity-budget
decision. Auto-sync stays importable as a raising stub for one cycle
so external callers see a clean ReplayInputAdapterError instead of an
ImportError. Full physical removal is filed as AZ-908 (cycle-5+ backlog).

Production:
- auto_sync.py: 700+ LOC -> 56-line no-op stub raising
  "auto-sync removed; supply --imu CSV instead"
- tlog_video_adapter.py: 700+ LOC -> 105-line deprecated stub;
  ReplayInputAdapter.open() raises immediately, close() is a no-op
- _replay_branch.py: dropped legacy auto-sync branch +
  _build_auto_sync_config; _validate_replay_paths now requires
  imu_csv_path; replay_input_adapter_factory parameter removed
- cli/replay.py: --time-offset-ms / --skip-auto-sync / --auto-trim
  emit DeprecationWarning + stderr line; values ignored
- tlog_replay_adapter.py + tlog_ground_truth.py docstrings: AUDIT-ONLY

Tests:
- DELETED test_az405_auto_sync, test_az405_replay_input_adapter,
  test_az698_window_alignment (covered code no longer runs)
- ADDED test_az895_auto_sync_deprecated_stub (5 parametrised, pins AC-1)
- test_az402_replay_cli: deprecation warnings + ignored-value asserts
- test_az401_compose_root_replay: new imu_csv_path-required gate;
  deleted the calibration-loading test that relied on the removed
  replay_input_adapter_factory injection point
- test_derkachi_real_tlog: xfail reason refreshed to AZ-848 + AZ-883
  (AC-4 "AZ-848-scoped reason")

Docs:
- module-layout.md: replay_input file list flags deprecated modules,
  adds csv_ground_truth.py
- _dependencies_table.md: +AZ-908 row, preamble + totals updated
  (179 -> 180 tasks, 567 -> 570 SP)
- AZ-908 backlog spec added; AZ-895 spec moved todo -> done
- batch_03_cycle4_report.md written

Touched-module tests green (111 passed, 1 skipped). Full unit suite
green: 2287 passed, 85 skipped, 1 deselected (pre-existing flaky perf
test, unrelated).

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_document/module-layout.md

@@ -395,13 +395,14 @@ Bootstrap reference: `_docs/02_tasks/todo/AZ-263_initial_structure.md`. Architec
 ### shared/replay_input
 
 - **Directory**: `src/gps_denied_onboard/replay_input/`
-- **Purpose**: Layer-4 cross-cutting coordinator that converges `(video, tlog)` inputs into the standard `FrameSource` + `FcAdapter` + `Clock` surfaces the airborne composition root consumes. Owns the time-alignment between video frames and tlog IMU/attitude ticks (manual via `--time-offset-ms` or automatic via the AZ-405 IMU-take-off detector). The composition root, in replay mode, builds a `ReplayInputAdapter`, calls `.open()`, and wires the returned `ReplayInputBundle` into the same C1–C5 pipeline as live. New under ADR-011 (replaces the v1.0.0 design where replay was a separate composition root).
-  - `__init__.py` (re-exports `ReplayInputAdapter`, `ReplayInputBundle`, `AutoSyncDecision`, `AutoSyncConfig`, `ReplayInputAdapterError`, plus the AZ-697 / AZ-836 surfaces: `TlogGpsFix`, `TlogGroundTruth`, `load_tlog_ground_truth`, `RouteSpec`, `RouteExtractionError`, `extract_route_from_tlog`)
-  - `interface.py` (`ReplayInputAdapter` class declaration + `ReplayInputBundle` DTO + `AlignedWindow` / `AutoSyncConfig` / `AutoSyncDecision` DTOs)
+- **Purpose**: Layer-4 cross-cutting coordinator. Under AZ-894 the production replay pipeline drives off the operator's IMU+GPS CSV via `CsvReplayFcAdapter`. The legacy `(video, tlog)` auto-sync surface was deprecated by AZ-895 and will be physically removed by AZ-908. The composition root, in replay mode, builds the CSV bundle (frame source + CSV FC adapter + clock) and wires the returned `ReplayInputBundle` into the same C1–C5 pipeline as live. New under ADR-011 (replaces the v1.0.0 design where replay was a separate composition root).
+  - `__init__.py` (re-exports `ReplayInputAdapter`, `ReplayInputBundle`, `AutoSyncDecision`, `AutoSyncConfig`, `ReplayInputAdapterError`, `CsvGpsFix`, `CsvGroundTruth`, `load_csv_ground_truth`, plus the AZ-697 / AZ-836 surfaces: `TlogGpsFix`, `TlogGroundTruth`, `load_tlog_ground_truth`, `RouteSpec`, `RouteExtractionError`, `extract_route_from_tlog`)
+  - `csv_ground_truth.py` (AZ-894 — `load_csv_ground_truth` + `CsvGpsFix` / `CsvGroundTruth`; the canonical replay ground-truth surface)
+  - `interface.py` (`ReplayInputAdapter` class declaration + `ReplayInputBundle` DTO + `AlignedWindow` / `AutoSyncConfig` / `AutoSyncDecision` DTOs — the auto-sync DTOs are deprecated by AZ-895 and slated for removal in AZ-908)
   - `errors.py` (AZ-405 — `ReplayInputAdapterError` envelope; subclass of `RuntimeError` so the airborne main maps every coordinator-scope failure to CLI exit code 2)
-  - `tlog_video_adapter.py` (concrete `ReplayInputAdapter` that instantiates `VideoFileFrameSource` + `TlogReplayFcAdapter` + chosen `Clock`)
-  - `auto_sync.py` (AZ-405 IMU-take-off / video-motion-onset detectors + combined offset computation + AC-8 frame-window-match validator)
-  - `tlog_ground_truth.py` (AZ-697 — `load_tlog_ground_truth` + `TlogGpsFix` / `TlogGroundTruth` for direct binary tlog GPS-truth extraction; consumed by `helpers.gps_compare` and `tlog_route.py`)
+  - `tlog_video_adapter.py` — **DEPRECATED (AZ-895)**: `ReplayInputAdapter.open()` raises `ReplayInputAdapterError`; retained as an import-stable stub for one cycle. AZ-908 removes it.
+  - `auto_sync.py` — **DEPRECATED (AZ-895)**: every detector + validator raises `ReplayInputAdapterError`; retained as an import-stable stub for one cycle. AZ-908 removes it.
+  - `tlog_ground_truth.py` (AZ-697 — `load_tlog_ground_truth` + `TlogGpsFix` / `TlogGroundTruth` for direct binary tlog GPS-truth extraction; AUDIT-ONLY after AZ-895, retained for the AZ-699 / AZ-701 validation paths against legacy `.tlog` archives)
   - `tlog_route.py` (AZ-836 — `extract_route_from_tlog` + `RouteExtractionError`; re-exports `RouteSpec` from `_types.route`. Reduces a tlog to a coarsened route via Douglas-Peucker on local ENU; consumed by `c11_tile_manager.route_client.SatelliteProviderRouteClient.seed_route`)
   - `tests/`
 - **Owned by**: AZ-265 (E-DEMO-REPLAY) — task AZ-405 (auto-sync + coordinator).