[Feature Request] Add PostWorktreeCreate hook and matcher support for selective worktree hook execution

Question

**Bug Description**
 [FEATURE] Additive PostWorktreeCreate hook + matcher support for worktree hooks▎ WorktreeCreate currently must own creation entirely — no fallback, no opt-out, no matcher — so to customize setup for one repo you have to reimplement git worktree add and re-emulate the default for every other repo, in a hook that fires globally. Two asks: (1) a PostWorktreeCreate hook that runs after the built-in creation (path passed in) purely for setup like uv sync/npm install; (2) matcher