Add Codex release skill copied from Claude release workflow

skills/release/SKILL.md

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+---
+name: release
+description: Prepare and ship a cmux release end-to-end: choose the next version, curate user-facing changelog entries, bump versions, open and monitor a release PR, merge, tag, and verify published artifacts. Use when asked to cut, prepare, publish, or tag a new release.
+---
+
+# Release
+
+Run this workflow to prepare and publish a cmux release.
+
+## Workflow
+
+1. Determine the version:
+- Read `MARKETING_VERSION` from `GhosttyTabs.xcodeproj/project.pbxproj`.
+- Default to a minor bump unless the user explicitly requests patch/major/specific version.
+
+2. Create a release branch:
+- `git checkout -b release/vX.Y.Z`
+
+3. Gather user-facing changes since the last tag:
+- `git describe --tags --abbrev=0`
+- `git log --oneline <last-tag>..HEAD --no-merges`
+- Keep only end-user visible changes (features, bug fixes, UX/perf behavior).
+
+4. Update changelogs:
+- Update `CHANGELOG.md`.
+- Update `docs-site/content/docs/changelog.mdx`.
+- Use categories `Added`, `Changed`, `Fixed`, `Removed`.
+- If no user-facing changes exist, confirm with the user before continuing.
+
+5. Bump app version metadata:
+- Prefer `./scripts/bump-version.sh`:
+  - `./scripts/bump-version.sh` (minor)
+  - `./scripts/bump-version.sh patch|major|X.Y.Z`
+- Ensure both `MARKETING_VERSION` and `CURRENT_PROJECT_VERSION` are updated.
+
+6. Commit and push branch:
+- Stage release files (changelog + version updates).
+- Commit with `Bump version to X.Y.Z`.
+- `git push -u origin release/vX.Y.Z`.
+
+7. Create release PR:
+- `gh pr create --title "Release vX.Y.Z" --body "..."`
+- Include a concise changelog summary in the PR body.
+
+8. Watch CI and resolve failures:
+- `gh pr checks --watch`
+- Fix failing checks, push, and wait for green.
+
+9. Merge and sync `main`:
+- `gh pr merge --squash --delete-branch`
+- `git checkout main && git pull --ff-only`
+
+10. Create and push tag:
+- `git tag vX.Y.Z`
+- `git push origin vX.Y.Z`
+
+11. Verify release workflow and assets:
+- `gh run watch --repo manaflow-ai/cmux`
+- Confirm release exists in GitHub Releases and includes `cmux-macos.dmg`.
+
+## Changelog Rules
+
+- Include only user-visible changes.
+- Exclude internal-only changes (CI, tests, docs-only edits, refactors without behavior changes).
+- Write concise user-facing bullets in present tense.
+

skills/release/agents/openai.yaml

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+interface:
+  display_name: "cmux Release"
+  short_description: "Prepare and publish cmux releases from version bump to tag."
+  default_prompt: "Use this skill to run the cmux release workflow: choose version, generate user-facing changelog updates, bump versions, open and monitor release PRs, merge, tag, and verify release artifacts."