Pull request template: what and why, screenshots, the house checklist

.github/pull_request_template.md

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+## What and why
+
+<!-- One or two sentences. Link the issue: Closes #123 -->
+
+## Screenshots
+
+<!-- For anything that draws: light and dark, and 280px wide if it holds a row or header. -->
+
+## Checklist
+
+- [ ] `scripts/check.sh` passes
+- [ ] The gallery shows it: a story on its chapter's page, and `python3 scripts/stories.py` rerun
+- [ ] Keyboard works: Tab reaches it, focus ring shows, Enter and Space press it
+- [ ] Reduced motion holds its motion still
+- [ ] `AGENTS.md` names any new rule or dependency
+- [ ] For `frontend/`: `pnpm test`, `pnpm build` and `pnpm e2e` pass