- config.py: remove robot_id field from SESConfig (no global default)
- session_client.py: robot_id is now REQUIRED in ask(), no fallback
- mfc_dialog.yaml: add explicit robot_id
- example_*.yaml: add commented robot_id placeholder, fix outdated comments
- config.yaml.example: remove robot_id from ses section
- README: full audit — remove archive references, fix deployment docs,
fix scenario format docs, remove outdated sections