debugViz render feature

Draws the batched geometry buffer that @builtin::modules.debugViz rebuilds every edit-mode tick from every registered provider — bounds boxes, camera frustums, and any further gizmo the debugViz core gains. One Draw pass over the core-owned vertex/index buffer pair, rasterized as GPU lines through the shared vertex-colour unlit material (@builtin::shaders.debugGeometry). An empty state (no providers with geometry yet, or the driving DebugViz component not yet awake) enqueues nothing.