style 'terrain' (WebGL2, tier-gated, dynamic import): height map baked once on the
GPU into RGBA8 (promoted from the terrain-tier-spike), a displaced grid, the baked
gradient as sky, baked sun/ambient/haze. Sky from option, ?sky=, or the stars'
night notion. Cadence guard, pauses, context loss and compile failure follow the
ridge scene. preview-config.js takes an optional style argument.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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