- Document Git worktrees as a general Git workflow in the Git docs
- Add cross-links from AI, tasks, worktree trust, and remote development
docs
- Include the `git::Worktree` action in the Git action reference

The main docs gap was that worktrees were mostly framed as an AI
isolation feature, while Zed implements them as a general Git workflow
through the title bar worktree picker.

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- N/A

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>