[AZ-399] [AZ-400] C8 TlogReplayFcAdapter + ReplaySink + JsonlReplaySink

Opens E-DEMO-REPLAY (AZ-265): the two C8 strategies that let the
upcoming compose_replay (AZ-401) and gps-denied-replay CLI (AZ-402)
run the production C1-C5 pipeline against a recorded (.tlog, video)
pair without touching live FC I/O.

AZ-400 lands the contract ReplaySink Protocol (emit + close per
replay_protocol.md v1.0.0) and JsonlReplaySink: orjson-serialised
JSONL, fsync-on-close, build-flag gated (BUILD_REPLAY_SINK_JSONL),
double-close idempotent, FDR mirror on open/close. The drifted
AZ-390 stub in interface.py is removed; the canonical Protocol now
lives in replay_sink.py per module-layout.md and is re-exported via
__init__.py. AZ-390 conformance test widened.

AZ-399 lands TlogReplayFcAdapter: full FcAdapter Protocol surface,
build-flag gated (BUILD_TLOG_REPLAY_ADAPTER), pymavlink stream-parse
with bounded pre-scan + fail-fast on missing required messages
(R-DEMO-3), dedicated decode thread feeding the existing AZ-391
SubscriptionBus. Outbound surface raises FcEmitError per Invariant 5;
request_source_set_switch raises SourceSetSwitchNotSupportedError.
Pacing honours Invariant 6 via Clock.sleep_until_ns. time_offset_ms
shifts every emitted received_at per Invariant 8. Non-monotonic
timestamps raise FcOpenError.

Test coverage: 188 c8_fc_adapter tests pass; 1 skipped (AZ-399 AC-1
500 MB tlog RSS bound, deferred to AZ-404 e2e behind RUN_REPLAY_E2E).
Code review: PASS_WITH_WARNINGS — 1 Medium (mapping logic duplicates
AZ-391 live decoder; intentional today, four behavioural deltas
documented), 2 Low.

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

_docs/02_document/module-layout.md

@@ -191,7 +191,7 @@ Bootstrap reference: `_docs/02_tasks/todo/AZ-263_initial_structure.md`. Architec
 - **Directory**: `src/gps_denied_onboard/components/c8_fc_adapter/`
 - **Public API**:
   - `__init__.py` (re-exports `FcAdapter`, `GcsAdapter`, `ReplaySink`, `EmittedExternalPosition`)
-  - `interface.py` (`FcAdapter`, `GcsAdapter`, `ReplaySink` Protocols)
+  - `interface.py` (`FcAdapter`, `GcsAdapter` Protocols; `ReplaySink` Protocol lives in `replay_sink.py` per the replay contract)
 - **Internal**:
   - `pymavlink_ardupilot_adapter.py` (ArduPilot Plane via pymavlink)
   - `msp2_inav_adapter.py` (iNav via MSP2)