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world_engine is CUDA-only and can't import on Apple Silicon, where the server advertises quark exclusively. The client setting defaulted to world_engine for all platforms and only clamped reactively from /health, so a standalone Mac launch tried world_engine first and failed. Normalize engine_backend to quark on darwin/arm64 at the settings layer (read/default/write) so it propagates via the InitRequest. Also pass quark an explicit "bf16" quant on Apple Silicon — quark reads quant=None as fp8-default and emits a RuntimeWarning when forcing bf16; passing it explicitly keeps the engine logs clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Fixes #64.
Blocked by us getting apple dev certificate. Do not merge until we get that.