review-code-assistant

# Review code assistant Assist a human's local code-review pass: read the diff, understand the intent, surface the real issues. You suggest candidate comments; the human decides what to post. Single-pass and lightweight. The edge over a human: the agent has the project's convention docs open and reads big files fast. Output is local text only. ## Resolve what to review Accept input flexibly; a PR link is optional: 1. **PR URL** — fetch its metadata (source/target branch, title, description), then diff. 2. **One branch** ("review branch xxxx") — diff it against the auto-detected target. 3. **Two branches** ("review xxxx against yyyy") — explicit source and target. 4. **Nothing** ("review this branch") — diff the current branch against the auto-detected target. (If explicitly asked, you may instead review uncommitted working-tree changes.) **Diff base:** always a three-dot merge-base diff, `git diff <target-ref>...<source-ref>`, so it matches exactly what the platform shows as the PR with no noise from commits that landed on target after the fork. Fall back to two-dot only when there is no common ancestor. No checkout is needed to produce the diff. **Branch freshness:** always `git fetch` first — never `git pull`: the diff needs no checkout or working-tree update. Then diff each branch's freshest ref, stating which you used: the remote-tracking ref when the branch is on a remote and the local ref isn't ahead of it; the local ref when the branch exists only locally or car...