This PR adds no changeset. If it releases nothing (including any 'skills/**' change -- see #5947), apply the 'skip-changeset' label; otherwise run 'pnpm changeset' and name the packages. An empty-frontmatter changeset is NOT a third option any more: the step below rejects newly added ones (#5471), because it is a real input to changesets/action and an all-empty set stalls the release silently and greenly (#4898). Full comparison in this step's log.