Add Codex repository baseline

docs/release-checklist.md

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+# Release Checklist
+
+## Version
+
+- [ ] Version number updated.
+- [ ] Changelog updated.
+- [ ] README updated.
+
+## Quality
+
+- [ ] Working tree is clean.
+- [ ] Lint/type checks pass or are documented as unavailable.
+- [ ] Tests pass or missing tests are documented.
+- [ ] Build succeeds in CI once CI exists.
+
+## Security
+
+- [ ] Security review is current.
+- [ ] Dependency audit is clean or documented once dependencies exist.
+- [ ] No secrets are committed.
+- [ ] Release artifacts do not contain local config files.
+
+## Artifacts
+
+- [ ] Artifacts are uploaded if the project produces artifacts.
+- [ ] Download links work if downloads are published.
+- [ ] Package registry links work if used.
+- [ ] Installer/portable/archive naming is clear if applicable.
+
+## Release
+
+- [ ] Git tag created.
+- [ ] Release notes written.
+- [ ] Release published.
+- [ ] Post-release download smoke test completed.