26bb0ac268b67c956f2086bf1e0b236f22add540
After /tool/signup, the client has a viewer_id but no Steam social row. The first authenticated request (typically /check/game_start) carries the Steam ticket; if the SteamId lookup misses but the UDID resolves to a viewer, attach the Steam social now. Subsequent requests hit the fast SteamId path. Closes the CheckController.GameStart TODO that was blocking fresh-client boot. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Description
The SV Simulator server code, including the DCG Engine, SVSim content, and an entrypoint for the official game client.
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