Add managed worktree tools to the TUI

[copyberry]

Add managed worktree tools to the TUI

What changed

Expose create_worktree, get_worktree_creation_status, and list_worktrees through MCP when the worktrees feature is enabled for a trusted local project and attachment storage is available. Support both embedded and local daemon sessions.

Create worktrees asynchronously and attach them to the requesting task, with ownership and attachments retained across restarts. Default to the repository's remote default branch unless ref is supplied. Keep the task's working directory and execution environment unchanged, and leave uncommitted source changes in place.

Reject creation in ephemeral side conversations and explicitly untrusted source projects, reuse pending operations, and reject configured MCP servers that conflict with the TUI tools namespace.

Testing

Add integration and model-request snapshot coverage for creation, polling, listing, attachment persistence across restart, task isolation, trust checks, namespace conflicts, and worker failure reporting.

[github-actions]

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