Worktree cleanup now also removes reftable files

A git worktree is an extra working copy of a repository that shares the same history. When Claude Code cleans up a worktree's admin folder (the small folder git keeps to track that copy), it previously deleted only a fixed list of files. It now also removes the files git writes when it uses reftable, a newer format git can use to store branch and tag references:

• tables.list
• files ending in .ref
• files ending in .log

These are only removed after Claude Code checks that each file is the one it expects. On macOS, when Claude Code opens a file inside a folder it is holding open, it now also confirms that the file it opened is the same one the folder listing named.