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      "description": "Move one synthetic event through four coordinate representations. Camera motion preserves the canonical event.",
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      "description": "Explore ideal vacuum-segment timing in an authored eight-light-second volume. Distances are compressed; this is not observed infrastructure.",
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  "light_speed_asset_change": "Uncredited decorative PNG replaced by an original procedural schematic globe. Numerical model and clock retained. Small screens use cached wireframe geometry and moving packets, DPR capped at 1.5 and drawing capped at 24 Hz.",
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