ci(gitflow): enforce branch and PR governance checks

.gitea/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+- TODO item reference (exact text): `...`
+- Scope (single primary TODO item): `...`
+
+## Checklist
+
+- [ ] Linked TODO item is in `TODO.md`
+- [ ] Branch name follows `todo/*`, `refactor/*`, or `code/*`
+- [ ] `bun run check`
+- [ ] `bun run typecheck`
+- [ ] `bun run test`
+- [ ] E2E validation plan included (`bun run test:e2e` or reason if deferred)
+
+## Notes
+
+- Risks / migrations / rollout notes: