Synced from monorepo

- Presence protocol end-to-end: live presence updates through the gateway to client presence tiers
- Worktree: narrow standalone origin fetch and drop inconsistent shallow clones
- Group hooked read-only tool calls in the pager
- Pager: Apple Terminal Cmd+click opens the first autolink across messages
- Emit CLI update telemetry for install attempts
- Recognize invalid-image rejections by the server’s error code
- Add typed Automations tool-usage card variant with render support
- Replace signal-based child process waits
- Rename system prompt `<output_efficiency>` to `<response_guidelines>`
- Retain the displayed session model when the model catalog refreshes
- Strengthen agent work discipline
- Explain the pager startup timeout
- Esc on the cancel-subagents panel keeps the turn running
- Explain video-tool ZDR restriction instead of dropping the tools
- Finish drag selection when the mouse release is lost
- Restrict session directories to owner-only permissions
- Install native arm64 on Apple Silicon, including from Rosetta shells and x86_64 updaters
- Strip trailing `/**` on sandbox allow paths
- Show interjection note on send-now turns
- Fire permission-prompt notification only on real UI wait
- Spawn the history-search matcher thread lazily instead of per prompt
- Point alpha update failures at `GROK_CHANNEL` reinstall
- Preset voices for `reference_to_video` via grok-imagine-video-1.5

Source-Revision: 5d08d7e4123092567ccd584cd9f99afa2972065c