Scene Flow Manager

Build the application flow of a game: boot → title → (login) → world, and every transition between contexts — plus the loading/lifecycle tech underneath and the player-facing flow design around it. References: Genshin Impact's documented client flow (dispatch → gate → EnterScene handshake), the bootstrap + persistent managers + additive content pattern, Half-Life/ God of War (cold-open onboarding), and FFXIV (queue UX). Excluded (separate skills): in-world spatial streaming (open-world-streaming), the screens inside a context (menu-ui-manager).

The architecture rules