RadixTopKSmall

[CC-Yeh]

• Multi-pass radix selection computes exact sorted top-k, one dispatch per pass.
• Deterministic f32 total order; ties prefer smaller index.

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[CC-Yeh]

@codex review

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Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 3c4ff4b839

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