Schema Unification (gbrain-base → gbrain-base-v2) v0.41.22 ships gbrain-base-v2 — a 15-type DRY/MECE taxonomy (14 canonical + catch-all) — as the install default for new brains. Existing brains on can opt in via the onboard finding + the PROTECTED Minion handler. This skill is the playbook for that migration. brain first: exempt This skill is ABOUT the brain's shape — it can't depend on the brain it's reshaping. No lookup first; jump straight to onboard. When this skill fires - Agent runs and sees or warnings - User asks "what is the canonical taxonomy / how do I clean up my page types / migr…