Skills CLI sync (AGENT_DEFINITIONS)

This app mirrors the agent list of the upstream vercel-labs/skills CLI. When upstream ships a release, AGENT_DEFINITIONS, UNIVERSAL_AGENT_IDS, and SKILLS_CLI_VERSION in src/shared/constants.ts must be re-synced, the docs refreshed, and the gates re-run. This skill encodes that procedure.

The steps below are invariant — they hold for any version bump. Concrete counts and agent names belong only to the "Latest run" section at the bottom; never bake a count into a step.

Source of truth

• Upstream: src/agents.ts (agent list) and src/types.ts (the Agent shape + home-dir helpers) in vercel-labs/skills.
• This app: the JSDoc on AGENT_DEFINITIONS, UNIVERSAL_AGENT_IDS, and SKILLS_CLI_VERSION in src/shared/constants.ts is authoritative — read it before editing. CLAUDE.md → Domain Concepts → Skills CLI lists the same pointers. Don't duplicate those rules here; this skill is the procedure.