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The engine is constructed per session, seated once from the master seed + both shuffled decks (F-N-5), and fed each frame via ShadowIngest — all inside a try/catch in ComputeFrames so a shadow failure can never break live dispatch (ND1/ND6). Routes still come from the existing handlers: wire output is byte-for-byte unchanged. FrameDispatchContext gains the Engine ref for N2+. csproj: PrivateAssets=compile on the engine ref so its global-namespace type surface (MessagePackSerializer, UserConfig, UserCard, ChallengeConfig, ...) does not leak transitively into SVSim.EmulatedEntrypoint (which references BattleNode) and collide with that project's own types; the runtime DLL still flows. All 238 BattleNode unit tests pass; EmulatedEntrypoint builds clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>