Render() rebuilt two VkBindHeapInfoEXT structs every frame and
recomputed reservedRangeOffset via a runtime subtract + bitmask
against Device::descriptorHeapProperties. The heap address/size per
slot are stable for a given heap; only currentBuffer varies.
Precompute numFrames resource/sampler bind structs and cache them,
keyed on the descriptorHeap pointer. The cache rebuilds whenever the
heap is (re)assigned and otherwise just indexes by currentBuffer.
Pointer-keyed invalidation catches any heap reassignment — the same
point a setter hook would fire — and is independent of onResize, as
the heaps never resize today (per the issue's correctness caveat).
Resolves#42
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
