Release and publish workflow

Public repository metadata

• For a public repository, the agent MUST set the GitHub Description, Topics, and Homepage fields.
• A public repository MUST contain: .github/workflows/ci.yml, issue templates, a PR template, SECURITY.md, CONTRIBUTING.md, CODE_OF_CONDUCT.md, and CHANGELOG.md.
• CI MUST run the repository's standard lint, test, and build commands.

Versioning and release flow