Feature: add scheduled Process Sentinel worker

[smithaldon1]

Summary

• Add a scheduled Process Sentinel worker entrypoint that loops on a configurable interval and logs run counts.
• Keep the existing one-shot CLI available by routing it through the shared one-shot worker helper.
• Wire Docker Compose sentinel-worker to the new runtime with SENTINEL_RUN_INTERVAL_SECONDS and docs/test coverage.

Closes #239

Test Evidence

• .venv/bin/python -m pytest services/process-sentinel/tests/test_worker.py: 5 passed.
• .venv/bin/python -m pytest services/process-sentinel/tests/test_worker.py services/process-sentinel/tests/test_rules.py services/process-sentinel/tests/test_governed_recommendations.py services/process-sentinel/tests/test_process_sentinel_readme_docs.py services/simulator/tests/test_docker_compose_runtime_docs.py: 23 passed.
• docker compose -f infra/docker/docker-compose.yml config: passed.
• PYTHONPATH=packages/factory-events:services/simulator:services/ingestion:services/process-sentinel:services/api FACTORY_STORAGE_BACKEND=jsonl FACTORY_EVENTS_STORE=.local/storage/sentinel_worker_smoke_events.jsonl SENTINEL_STATE_DIR=.local/storage/sentinel_worker_smoke .venv/bin/python -m process_sentinel.worker --once: completed with events=0 detections=0 evidence=0 recommendations=0.
• make test-unit: 181 passed, 2 skipped. Initial sandbox run failed on loopback socket bind; rerun with approval passed.
• make test-integration: 104 passed, 2 skipped.
• make test: 285 passed, 4 skipped.
• make lint: All checks passed.
• make typecheck: compileall completed successfully.
• Compose smoke with Demo-Factory running separately and FIP connector-worker/sentinel-worker: both workers healthy; Sentinel logs showed repeated runs with events=260 detections=0 evidence=0 recommendations=0; Postgres count query returned events=260, detections=0, evidence=0, recommendations=0.

Docs Impact

• Updated .env.example, Process Sentinel README, Docker Compose runtime docs, troubleshooting env list, and docs/LEARNING_LOG.md.

Follow-up Work

• Current Demo-Factory protocol events do not yet match the legacy fill-weight/nozzle Process Sentinel rules, so the Compose smoke verifies scheduled runs over external-source events but produces no detections. New rules are explicitly out of scope for Feature: Add scheduled Process Sentinel worker #239.
• Task: Add Compose smoke test #241 should add the end-to-end Compose smoke gate across ingestion, Sentinel, API, and Workbench.

[smithaldon1]

Reviewed and approved for merge