cd

Overview ¶

Package cd implements the `cd` shell built-in. Real bash semantics: change the working directory; mvdan/sh ships its own `cd` that mutates the runner's Dir. Our registration is reachable via /bin/cd and CANNOT mutate the runner's Dir (it has no back-channel), so it functions as a path-validation + diagnostic stub: it resolves the target via c.FS.Stat and emits a clean error if missing.

Documented shadow in DECISIONS.md (Phase 11).