PR comment triage

Work a PR's review comments to done: every thread ends either with a fix on the branch or a reply explaining why no fix was needed.

1. Collect

Fetch inline threads and top-level reviews. Collapse overlapping bot comments (Codex and Copilot routinely flag the same issue) into one distinct issue per underlying claim:

gh api --paginate repos/ponti-studios/hominem/pulls/<N>/comments \
  --jq '.[] | "\(.id) | \(.path):\(.line // .original_line) | \(.user.login)"'
gh pr view <N> --json reviews,comments --jq .
gh pr checks <N>