CNN v2 Phase 5: render pipeline implementation

Complete multi-pass compute execution for CNNv2Effect.

Implementation:
- Layer texture creation (ping-pong buffers for intermediate results)
- Static features compute pipeline with bind group layout
- Bind group creation with 5 bindings (input mips + depth + output)
- compute() override for multi-pass execution
- Static features pass with proper workgroup dispatch

Architecture:
- Static features: 8×f16 packed as 4×u32 (RGBD + UV + sin + bias)
- Layer buffers: 2×RGBA32Uint textures (8 channels f16 each)
- Input mips: 3 levels (0, 1, 2) for multi-scale features
- Workgroup size: 8×8 threads

Status:
- Static features compute pass functional
- Layer pipeline infrastructure ready
- All 36/36 tests passing

Next: Layer shader integration, multi-layer execution

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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