Use when building a NEW gimmick from intent — "make it react when someone touches the tail", "a prop I can drop in the world", "a pettable head", "sync this state to everyone" — or when authoring a new `vrc-patterns` library entry ("add a pattern", "write this up as an entry"). Covers anything wiring contacts, physbone grabs, constraints, or synced params into interactive behavior, including a new gimmick cloned from a pattern or another avatar's idea. Not starting from an existing module you'll keep — cutting/trimming one is own-gimmick; not composing a ready-made gimmick module (compose-mergeable); not menu controls alone (author-menu).
