card: replace sibling distractor numbers with this model's own measurements (unicode Tibetan)

card: Tibetan script and Wylie both supported (measured equivalent); distractor table note finalized

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Update README.md

Update README.md

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model card: add 25k-distractor benchmark table (sibling checkpoint, labeled)

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mitra-qwen35-embedder: 9B classical-Buddhist retrieval embedder (dr-BEST200)

initial commit