Remote Control worktree cleanup keeps worktrees whose checkout moved or could not be checked

A worktree is a separate working copy of your project. When a Remote Control session tears down its worktree, it now keeps it in two cases:

• The checkout moved.
• The check for changes failed, labelled "could not check for changes".

Shutdown cleanup also passes a read deadline. When the logged id differs from the real work id, stopWork logs a redacted error showing only the status or the error name.