pr-comments.mdc

goal: address PR comments

- get PR comments
```bash
# Find PR for current branch
gh pr list --head $(git branch --show-current) | cat

# Get inline comments (most important)
gh api repos/:owner/:repo/pulls/PR_NUMBER/comments --jq '.[] | {author: .user.login, body: .body, path: .path, line: .line}' | cat

# Get review comments if needed
gh api repos/:owner/:repo/pulls/PR_NUMBER/reviews --jq '.[] | select(.body != "") | {author: .user.login, body: .body}' | cat
```

- if no PR exists, abort
- suggest fixes for each comment
- always use `| cat`