Synced from monorepo

Synced from monorepo

Changes:
- Add shortcut_used telemetry for Ctrl+L actions
- Clarify dashboard overlay prev/next shortcut hint
- Fix authentication token suffix handling
- Add ACP session/resume and session/close
- Cap live workflow subagents at 16 per run
- Allow model switch during plan approval
- Render consistent model names in settings
- Preserve errno across signal callbacks
- Extract MCP images before output truncation
- Stop sandbox from refusing to start when deny globs walk a large workspace
- Stream the fork copy so large sessions fork in bounded memory
- Replay file-mention input chunks as user attachment links

Source-Revision: d6937fe255dce4133c3d000a50f9cb94de12f06f