refactor(skills): cleanup dead code + full workflow A→B→C→D integration

Cleanup:
- Remove unused validate_yaml() helper from lib.sh
- Remove USER_MANUAL.html + mqtt-broker-setup.html (no refs found)

Workflow A (create_session ↔ delegate-job):
- Add --submit-job <prompt> option to create_session.sh
- Auto-register session in delegate-job registry, store delegate_job_id in YAML

Workflow B (push-based monitor):
- Migrate reconcile.sh to MQTT subscriber mode (polling fallback preserved)

Workflow C (unified status):
- status.sh now shows session + delegate-job state in single column

Workflow D (audit log + perms):
- JSON job files chmod 600
- create/delete/resume now publish lifecycle events to delegate-job

.gitignore

@@ -11,4 +11,8 @@ test-sessions.yaml.lock
 .hermes/
 .venv/
 __pycache__/
-*.pyc
+*.pyc
+
+# 빌드/배포 HTML 산출물
+skills/delegate-job/USER_MANUAL.html
+skills/delegate-job/mqtt-broker-setup.html