* refactor: split worktrees.ts under 400 lines
Move the worktree slice into dest modules under store/slices/worktrees/ and leave a thin public barrel so existing imports keep working.
* refactor: nest worktrees dest modules by domain
Group the extracted slice files into catalog, refresh, create, remove, and related domain folders instead of a flat dest dump.
* refactor: group worktrees dest modules by lifecycle
Collapse the 12 noun folders into listing, create, teardown, metadata, and session so dest layout matches the slice methods.
* rm duplicated mport