GCP-02: Cloud Scheduler — Replace Daemon Sleep Loops

Replace time.sleep() loops in cloud_lu_daemon.py with Google Cloud Scheduler jobs hitting Cloud Run HTTP endpoints. Current pain: If the daemon loop crashes or hangs, ALL scheduled work stops. A stuck sleep() is invisible. Architecture: 1. Decompose daemon_loop() into independent HTTP handlers: - POST /tick/neural-bus -> check_and_route_messages() (every 30s) - POST /tick/heartbeat -> sibling_pulse upsert (every 5m) - POST /tick/limitless -> _sync_limitless_ambient() (every 30m) - POST /tick/foundry -> foundry claim+dispatch cycle (every 2m) 2. Create Cloud Scheduler jobs for each endpoint 3. Each job uses OIDC token for authenticated Cloud Run invocation 4. cloud_lu_daemon.py becomes a Flask/FastAPI app with routes, no while-True loop Deliverables: - Refactored cloud_lu_daemon.py (HTTP handlers, no sleep loops) - gcloud scheduler create-job commands or Terraform for all 4 jobs - Health check endpoint GET /health for Cloud Run liveness probe - Idempotency guards: if a tick handler is still running when next tick fires, skip Target: c8_platform/cloud_lu_daemon.py (refactor) + c8-infra/scheduler/