cmux Release

Use the /release command to prepare a new release. This will:

1. Determine the new version (bumps minor by default)
2. Gather commits since the last tag and update the changelog
3. Update CHANGELOG.md (the docs changelog page at web/app/docs/changelog/page.tsx reads from it)
4. Run ./scripts/bump-version.sh to update both versions
5. Commit, run ./scripts/release-pretag-guard.sh, tag, and push

Version bumping

./scripts/bump-version.sh
./scripts/bump-version.sh patch
./scripts/bump-version.sh major
./scripts/bump-version.sh 1.0.0