* Add agent enablement controls
Implements the Enable/Disable Agents Dashboard behavior described in docs/enable-disable-agents-dashboard.md, including persisted agent enablement state, filtered launch surfaces, and settings UI affordances.
* Clarify agent availability controls
* Respect disabled agents across workspace and AI defaults
- Filter disabled TUI agents from mobile and quick workspace selection
- Avoid implicitly choosing disabled agents for commit/PR AI settings
- Broadcast settings changes to open windows for disabled-agent updates
* rm design doc
* fix: complete agent enablement propagation
Jinjing
Brennan Benson
Leynier Gutiérrez González