Add PR credits tracking for V2 launch

Track community PRs to thank contributors when V2 goes public.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/pr-credits.md

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+# PR Credits — Thank After V2 Goes Live
+
+When V2 is pushed to the public repo, comment on each PR to thank the contributor and let them know their work was integrated.
+
+## Integrated (cherry-picked into V2)
+
+| PR | Author | What | Status |
+|---|---|---|---|
+| [#17](https://github.com/mvanhorn/last30days-skill/pull/17) | **@JosephOIbrahim** | Windows Unicode fix (cp1252 emoji crash) | Merge or close with thanks |
+| [#16](https://github.com/mvanhorn/last30days-skill/pull/16) | **@levineam** | Handle 403 model access errors + gpt-4.1 fallback | Merge or close with thanks |
+| [#18](https://github.com/mvanhorn/last30days-skill/pull/18) | **@jonthebeef** | `--days=N` configurable lookback flag | Merge or close with thanks |
+| [#1](https://github.com/mvanhorn/last30days-skill/pull/1) | **@galligan** (Matt Galligan) | Marketplace plugin conversion — we took a lighter approach inspired by his PR | Close with thanks, explain lighter approach |
+
+## Already Fixed in V2 (close with thanks)
+
+| PR | Author | What |
+|---|---|---|
+| [#15](https://github.com/mvanhorn/last30days-skill/pull/15) | **@rszrszrsz** | YAML argument-hint fix — already fixed in V2 |
+| [#11](https://github.com/mvanhorn/last30days-skill/pull/11) | **@nerveband** | Same YAML fix (earlier) — already fixed in V2 |
+
+## Not Integrated (close with explanation)
+
+| PR | Author | What | Why |
+|---|---|---|---|
+| [#5](https://github.com/mvanhorn/last30days-skill/pull/5) | **@jblwilliams** | Codex auth with OpenAI Responses API | Good idea, too complex for now (358 lines SSE/JWT). May revisit. |
+| [#14](https://github.com/mvanhorn/last30days-skill/pull/14) | **@thangman1** | WebSearch-first, API keys optional | Philosophical shift — V2 already does WebSearch in parallel |
+| [#10](https://github.com/mvanhorn/last30days-skill/pull/10) | **@thetechreviewer** | OpenRouter API integration | Too large (1029 lines), adds MCP server |
+
+## Suggested Comment Template
+
+> Thanks for this PR! We integrated your [fix/feature] into V2 (commit XXXXX). Really appreciate the contribution. 🙏
+>
+> Closing this PR since the changes are now in main via a different commit, but full credit to you for the idea and implementation.