[contrib] Add CodeGen-350M-mono NeuronX port#74

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contrib/codegen-350M-mono

Commits on Mar 18, 2026

Add CodeGen-350M-mono contrib model with partial RoPE and fused QKV support

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claude
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Add performance metrics to README

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Commits on Mar 19, 2026

Standardize Performance section format in README

dhwanw
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claude
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