ci / rust (push) Successful in 5m56s
Add a pure `gitroot::find_root` resolver that walks up from a path to the nearest ancestor holding a `.git` entry (directory or linked-worktree file) and returns that repo toplevel, else None. Mirrors the `dirlist` module shape: filesystem-only, no `git` subprocess, unit-tested in isolation. Drives the spawn form's worktree section (#21): infer `base_repo` from the chosen working dir so a worktree spawn needs only a branch. HTTP/wire exposure lands in #26. Closes #25 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>