fix: canonical trained input format (query:/capability: labels, 1200 chars, left-pad last-token); drop leaked retriever Instruct prompt

fix: canonical trained input format (query:/capability: labels, 1200 chars, left-pad last-token); drop leaked retriever Instruct prompt

rm stray pyc

Matrix v6 reranker — packaged release (safetensors + modeling + tokenizer + card + provenance final.pt)

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initial commit