68367db2140580c0e4869c3654110fa7144c770e
POST /tool/signup upserts a Viewer keyed on the resolved request UDID (via the existing SID->UDID dict). Stashes the viewer on HttpContext so the translation middleware emits viewer_id/short_udid/udid in data_headers. Empty data payload -- all signup outputs flow in data_headers per spec. Idempotent: repeat signups for the same UDID return the existing viewer. 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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