Owner decision 2026-10-26: the manager must not change the game's visual
identity. The app colours tab is read-only (current value or the game's
default from its tokens.css), the image slots are read-only, and the write
paths are removed: branding/game-color, branding/game-color/reset and
branding/upload-asset (routes and methods). updateColor and the palette reset
now touch only the manager's own palette keys that the game never reads, so
no request can reach a platform_theme key the game reads; nothing in the
manager writes platform_assets or theme_settings.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>