feat(WP-0002): complete Triggers & Ops workstream

Delivers all 12 tasks (T22–T33): Temporal Schedule manager + startup
sync, NATS JetStream event router, FastAPI CRUD + manual trigger,
Prometheus metrics wiring, custom search-attribute tagging, and
operational runbook. Marks workplan status as done.

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

pyproject.toml

@@ -10,6 +10,7 @@ dependencies = [
     "fastapi>=0.115",
     "uvicorn[standard]>=0.32",
     "alembic>=1.14",
+    "nats-py>=2.7",
 ]
 
 [project.optional-dependencies]