d119d2c27711d1a5cefd9b6b9bdb5279acca02cf
Behavior-preserving; 231 BattleNode tests green. The envelope key set was encoded three times (ReservedEnvelopeKeys, the ToJson writes, the FromJson reads). Added a private nested MsgEnvelope.Keys with a const per key; the reserved set, writes, and reads now all draw from it, so a key added in one place but not another (letting a body key shadow an envelope field) can no longer happen. Co-Authored-By: Claude Opus 4.8 <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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