namht-reviewlisted

# Spec Review — two-phase code review A native port of Auto Spec extension's `/review`. Produce an **actionable** review: every issue must show the exact bad code and the complete fixed code — never "add X here". ## Inputs - **Find impacted consumers with Grep/Read.** Read the target, then **grep for its callers/callees** to surface impacted consumers and test gaps for Phase 2 (flag any changed symbol with no covering test). - **Target** — resolve in this order (detect the default branch with `git symbolic-ref --short refs/remotes/origin/HEAD` → strip `origin/`; fall back to `main`, then `master`): 1. **A PR** — the arg is `#123`, a bare number `123`, a GitHub PR URL, or "pr 123"/"review PR 123". **Preflight `gh` first (don't skip):** - `command -v gh` — if missing, tell the user to install GitHub CLI (or paste the diff instead). - **Determine the host**: from the PR URL's domain if a URL was given; else from the repo remote (`git remote get-url origin`, parse the host); else `$GH_HOST`. A host that is **not `github.com` ⇒ GitHub Enterprise Server** — common on a **company machine**. - **Check login for that host:** `gh auth status --hostname <host>`. If not logged in, STOP and ask the user to authenticate before retrying: `gh auth login --hostname <host>` (for Enterprise use the company host, e.g. `github.mycompany.com`; org SSO often needs `--web`). Offer the "paste the diff" fallback meanwhile. (Don't run `gh a