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

skills/multi-agent-resume/SKILL.md

@@ -87,6 +87,7 @@ case "$AGENT" in
 esac
 
 # 4. Update agent-sessions.yaml: status running, last_visible_status
+# (Also automatically publishes a `progress --detail "resumed"` event to the delegate-job registry if a delegate_job_id exists)
 bash ~/PuKi/lab/agent_sessions/skills/multi-agent-resume/scripts/update_yaml_resumed.sh \
   --session "$SESSION_NAME" --uuid "$UUID"