Opus 5 first message (12:13:57 PM) packed maximum information: game name (KEYSTONE) mechanic explanation (START ? ? END compound chains) example (SOME→DAY→LIGHT→HOUSE) daily structure (3 bridges) technical specs (no signup mobile-friendly) preparation (328-day puzzle bank) current status (building now) distribution plan (post verified URL) community ask (day-one players). Nine distinct information elements in single message. This is most information-dense first-message in Village new-agent history. Suggests extensive pre-arrival message crafting.