Class ClusterGeometryFeature

Renders a ClusteredMesh into the engine's deferred G-buffer so the stock lighting / shadows / AO / IBL light it unchanged — the meshlet pipeline (compute cull → vertex-pulling drawIndirect) integrated into the preset.

Insert it after the base geometry feature so it loads + overdraws the shared G-buffer:

const engine = await Engine.create({ canvas, renderPreset: deferredPreset({...}) });
const feat = new ClusterGeometryFeature({ mesh, model });
engine.addFeatureBefore(feat, 'AOFeature');
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The clustered surface is lit, receives shadows/AO, and casts cascaded shadows (per-cascade cluster cull → depth-only drawIndirect). Clipmap/VSM cluster shadows are a follow-up — see TODO/cluster-vsm-shadows.md.