feat(WP-0004): railiance deployment & service ops

- Dockerfile (multi-stage, uv-based, slim runtime)
- .dockerignore
- docker-compose.railiance.yml (Temporal + NATS + PG, no Elasticsearch)
- GET /health endpoint (db + temporal probes, 200/503)
- .env.example (complete env var reference)
- Makefile: migrate, sync-all, dev-up/down, railiance-up/down,
  start-worker, start-api, start-event-router, help targets;
  extracted sync-event-types Python to scripts/sync_event_types.py
- SIGTERM graceful shutdown in worker.py and event_router.py
- docs/runbook.md: Railiance deployment section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/sync_event_types.py

@@ -0,0 +1,21 @@
+import asyncio
+import os
+
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+
+from activity_core.event_type_registry import sync_event_types
+
+
+async def main() -> None:
+    db_url = os.environ.get(
+        "ACTCORE_DB_URL",
+        "postgresql+asyncpg://actcore:actcore@localhost:5433/actcore",
+    )
+    engine = create_async_engine(db_url)
+    factory = async_sessionmaker(engine, expire_on_commit=False)
+    n = await sync_event_types(factory)
+    print(f"Synced {n} event types")
+    await engine.dispose()
+
+
+asyncio.run(main())