Apply updated Codex repository kit

docs/release-checklist.md

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+# Release Checklist
+
+## Version
+
+- [ ] Version number updated.
+- [ ] Changelog updated.
+- [ ] Release notes updated.
+
+## Quality
+
+- [ ] Working tree is clean.
+- [ ] Gitea Actions build workflow succeeds.
+- [ ] Frontend lint passes.
+- [ ] Rust format and clippy pass.
+- [ ] Known skipped checks are documented.
+
+## Security
+
+- [ ] Security review is current.
+- [ ] No secrets are committed.
+- [ ] Connected Library external URLs are documented.
+- [ ] Private repo authentication remains disabled unless explicitly designed.
+
+## Artifacts
+
+- [ ] Desktop app artifact names are known.
+- [ ] Installer or archive output paths are documented.
+- [ ] Download links work if release artifacts are published.
+
+## Release
+
+- [ ] Git tag created only when explicitly requested.
+- [ ] Release notes written.
+- [ ] Release published only when explicitly requested.
+- [ ] Post-release install/update smoke test completed.