List a studio project's stored versions, newest first: {version, created_at, label, current}, plus every named version (snapshots) and how many of the 20 names are used. A project keeps its newest 20 saved versions, one per 10 minutes for the last day, one per day for the last 30 days, and every named snapshot (up to 20); older unnamed versions are deleted. Refuses: a project_id outside your scope (NOT_FOUND): studio_project_list lists your projects; pass one of their ids; a limit outside 1 to 50 (VALIDATION_ERROR): pass a smaller limit. Free; reads only.