Never auto-merge release-please PRs

Do not auto-merge release PRs. Skip:

• release-please: branch starts with release-please--, or title starts with chore(release) / chore(<scope>): release / chore: release
• changeset Version Packages: branch starts with changeset-release/, or title is Version Packages / chore: version packages

Ordinary feat / fix / ci PRs may still automerge.

How to apply: fix/CI babysit only; human merges releases. Generic automerge should skip those branch/title patterns from the default branch so a PR cannot rewrite the skip table. See tech-release-please-basics, project-open-managed-agents.