[Stack 13/27] Vectorize participant info computation (3-15x speedup)#2437

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jucor wants to merge 6 commits intojc/regression-test-perffrom

jc/vectorize-participant-info

Commits on Mar 30, 2026

Address Copilot review: clarify MAP estimate, centralize PSEUDO_COUNT imports

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Update plan: add stack cross-reference and GitHub PR numbers

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Vectorize _compute_participant_info_optimized for ~100x speedup

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Add benchmark script for participant info vectorization

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Address Copilot review: drop unused cache, validate --runs, tighten type assert

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Remove old participant_stats() in favor of vectorized replacement

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