qector-batch-decoding

Batch, streaming, and GPU-accelerated decoding paths for QECTOR. Covers the manual 13 CUDA / OpenCL bit-identity contract, the per-thread scratch sizing formula (manual 13.4), the warm-up / dispatch / hot-path pattern, the worker-thread determinism guarantee (manual 26.3), and the cold-path / hot-path reporting rule. Load when a question involves millions of shots, GPU acceleration, batch decode, or performance…