- add process health bridge and monitoring flow between display_manager and simclient
- publish health + warn/error log topics over MQTT
- standardize log/payload/screenshot timestamps to UTC (Z) to avoid DST drift
- improve video handling: python-vlc fullscreen enforcement and runtime PID reporting
- update README and copilot instructions with monitoring architecture and troubleshooting
- add Phase 3 monitoring implementation documentation
- update gitignore for new runtime/log artifacts
