QComputeMode
How a weight-only-quantized contraction (qmatmul_woq / qlinear_woq / the *_woq conv family) contracts a floating-point activation against a quantized weight. ExactFP (the default) dequantizes the weight and runs the float dot, bit-faithful to the stored scale / zero-point. DynamicInt8 dynamically quantizes the activation to int8 and runs an integer dot, faster on dot-product hardware, at a small accuracy cost (the activation loses precision). A ROUTING HINT, not a shape contract: shapes outside a backend's fused coverage fall back to exact math.