- Add socket handler and server implementations for real-time communication
- Add Mattermost integration (auth service, push client, plugin client)
- Add Mattermost push host integration tests
- Update Flutter client app with new app structure and bootstrap
- Update Android build configurations and add Google Services config
- Add asset keep file for Flutter client
- Update agent-roadmap with api-centered-proto-socket-rail milestone
- Update agent-task with planning and code review documents for all groups
- Update domain rules for api, client, worker and project rules
