Add baseline reconciliation: accept audited drift with a reason

Implements the v0.9 roadmap item from the approved design spec. Operators
accept a specific FIM/package/listener/SUID drift item with a mandatory
reason; the ack suppresses that one alert only while the live state still
matches the recorded fingerprint. Content kinds (fim/pkgfile) re-alert on
further change; identity kinds (listener/suid) retire on TTL or revoke.

- reconcile.py: ReconcileStore (mtime-cached, fails closed on missing/corrupt
  store), fingerprint builders, and the filter_alerts chokepoint.
- CLI: baseline accept/revoke/list with --reason/--expires/--force/--stale/--json.
- Wired at the daemon sweep + eBPF chokepoint, fim-check, and /api/integrity.
- RECONCILE_V1 schema, config knob, COMMAND_REFERENCE/SCHEMAS/OPERATIONS/ROADMAP
  docs, and reconcile unit/CLI/integration tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

enodia_sentinel/config.py

@@ -172,6 +172,9 @@ class Config:
 
     # paths
     log_dir: Path = Path("/var/log/enodia-sentinel")
+    # Baseline-reconciliation acknowledgement store (accepted FIM/package/
+    # listener/SUID drift). Empty = log_dir/reconciliation.json.
+    reconcile_store: str = ""
 
     # ---- derived paths ---------------------------------------------------
     @property