v0.57.7: Opus 4.6 Fast, /fork command, session archiving, and org-managed settings

New features

- Claude Opus 4.6 Fast - Added Opus 4.6 Fast as a new model option in the model selector
- /fork command - Duplicate your current session with all messages preserved into a new session
- Org-managed settings - Local settings that are set by your organization are now locked from editing
- Session archiving - Archive sessions from the web app to keep your sidebar clean (Factory App)

Bug fixes

- Shell environment loading - Shell environment now loads consistently across Factory App, sandbox, and computer platforms
- Orphaned browser processes - Agent-browser daemon processes are now cleaned up properly
- Task tool output - Progress updates from Task tool are now truncated to prevent UI overflow