Enable static quantization for Qwen3-0.6B decoder (transformer-only)

[spalne]

Adds a transformer-only ONNX export path for Qwen3 that emits a fused (GQA) GroupQueryAttention op (with built-in rotary), LpNormalization RMSNorm, and 1×1 Conv projections, backed by an FP16 KV cache. The path is opt-in via install(), which hot-patches the build registries to produce two graphs (prefill seq=64, decode seq=1) without embeddings or lm_head. Quantization runs w8a16 static PTQ on these graphs using GSM8K calibration

Results

Produces two transformer-only ONNX files (prefill + decode) plus their w8a16-quantized variants.

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