vs-core-init
Create or extend a project-root CLAUDE.md. Two modes. INIT writes a new seed file after a short interview plus a silent probe; auto-selected when no CLAUDE.md exists. APPEND inserts a single learning (a gotcha, a command, a common flow, a knowledge-drift note) into the existing CLAUDE.md at the right section; auto-selected when CLAUDE.md exists and the user has a specific thing to add. Use when the user says "init this project", "generate a CLAUDE.md", "/vs-core-init", "add this to CLAUDE.md", or when a session surfaces a learning worth persisting.