## Summary
- Move the author-vs-commenter check from the Claude prompt into
workflow-level `if:` conditions so Case 1 (original author follow-up)
and Case 2 (third-party comment) route deterministically.
- Case 2 no longer invokes Claude — it just posts the fixed redirect
comment with `gh issue comment`.
- Skip bot-authored comments to prevent loops.

Previously the single-prompt design conflated the two cases when a
maintainer's closing comment mentioned the original author and described
the symptom, causing the bot to re-open the issue under Case 1 even
though COMMENT_AUTHOR did not match ISSUE_AUTHOR (see
dyad-sh/dyad#3228).

## Test plan
- [ ] Trigger a closed-issue comment from a non-author account → expect
only the redirect comment, no re-open, no LLM usage.
- [ ] Trigger a closed-issue comment from the original author expressing
the issue still occurs → expect re-open + "we've re-opened the issue"
comment.
- [ ] Trigger a closed-issue comment from the original author that's
just a thank-you → expect no action.
- [ ] Bot comment on a closed issue → no workflow run.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
<!-- devin-review-badge-begin -->

---

<a href="https://app.devin.ai/review/dyad-sh/dyad/pull/3270"
target="_blank">
  <picture>
<source media="(prefers-color-scheme: dark)"
srcset="https://static.devin.ai/assets/gh-open-in-devin-review-dark.svg?v=1">
<img
src="https://static.devin.ai/assets/gh-open-in-devin-review-light.svg?v=1"
alt="Open in Devin Review">
  </picture>
</a>
<!-- devin-review-badge-end -->