Add documentation for the undocumented IDENTITY.md → PWA manifest
customization feature:
- Updated agent-workspace.md to explain that the Name field in IDENTITY.md
automatically customizes the Control UI PWA manifest
- Added dedicated PWA customization section to control-ui.md with examples
- Documented the current limitation: name changes after initial setup
require manual manifest editing
- Included workaround steps for runtime name changes
This feature allows users to personalize their Clawdbot PWA appearance
(e.g., 'Nova - Clawdbot Control' instead of generic 'Clawdbot Control').
Add Mattermost as a supported messaging channel with bot API and WebSocket integration. Includes channel state tracking (tint, summary, details), multi-account support, and delivery target routing. Update documentation and tests to include Mattermost alongside existing channels.
