Squashed from work; the fine-grained history is under tag archive/work-2026-08-26:
- render+sim: the two hooks the model viewer already relies on
- viewport: Realtime gets the engine's cascaded shadow pass, the NOAA sun, metered exposure with sky ambient, a haze knob, a time-of-day slider in the header, and no grid — the building itself still waits for its casters and direct light
- render: the engine's receiver shader takes the sun with two-sided normals and the shadow term for the model batches
- fab: a 3D creation shell and the viewer built on it
- render: two shaders that never compiled — a let is not assignable, a var is
- sim: a declared map facing becomes a body's heading through one rule
- render: a HUD that already reads as a game's before anyone styles it
- asset+sim: the two modules their own commits already declared
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