Respond to PR comments

Answer every review comment on a PR that has not been answered yet. One comment at a time: investigate, decide, fix if accepted, reply.

1. Resolve the target

PR="${1:-$(gh pr view --json number -q .number)}"
REPO=$(gh repo view --json nameWithOwner -q .nameWithOwner)
ME=$(gh api user -q .login)

If gh pr view finds no PR for the current branch, stop and say so.

2. Collect comments

Three sources, all of them: