brain-taxonomist Purpose Gate function: Before creating ANY new brain page, consult this skill to determine the correct filing path. This prevents misfiling at write time rather than cleaning up drift after the fact. Drift function: Periodic scan for pages that have outgrown their current location. Contract This skill guarantees: - Every new page is filed at the path determined by the ACTIVE schema pack — never against a hardcoded directory table baked into this skill. - The decision is reproducible: invoking brain-taxonomist twice on the same content produces the same recommended path. - Amb…