Implementer caught that the original Task 2 (replace UploadRgba8 target
with Texture2DArray) would break four legacy consumers whose shaders
sample via sampler2D: WbDrawDispatcher (pre-rewrite path),
StaticMeshRenderer, InstancedMeshRenderer (legacy escape hatch),
ParticleRenderer.
Revised: Task 2 ADDS a parallel UploadRgba8AsLayer1Array. Existing
UploadRgba8 (Texture2D) stays for legacy callers. Task 3's Bindless*
methods will call the new array path with their own cache dictionaries.
Same surface may be uploaded twice during transition; bounded cost.
N.6 cleanup deletes the legacy path.
Task 3 will be amended at dispatch time to reflect parallel caches.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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