chore: add GitHub community health files

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- What does this PR change and why? -->
+
+## Type of change
+
+- [ ] New command
+- [ ] New / updated skill reference
+- [ ] New anti-pattern guidance
+- [ ] Bug fix
+- [ ] Documentation update
+- [ ] Build system / tooling
+- [ ] Other: 
+
+## Checklist
+
+- [ ] Source files updated in `source/`
+- [ ] `bun run build` ran successfully and `dist/` is committed
+- [ ] `bun test` passes
+- [ ] Tested with at least one provider (Cursor / Claude Code / Gemini CLI / Codex)
+- [ ] README / DEVELOP.md updated if needed