chore: audit(2026-05) phase 2a slice 3: extract cross-validation concern

[ooples]

Stacked on #1433. Smallest slice — single ConfigureCrossValidation method into IAiModelCrossValidation<T,TInput,TOutput>. 3/3 tests pass, both TFMs build clean.

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🤖 PR Title Auto-Fixed

Your PR title was automatically updated to follow Conventional Commits format.

Original title:
audit(2026-05) phase 2a slice 3: extract cross-validation concern

New title:
chore: audit(2026-05) phase 2a slice 3: extract cross-validation concern

Detected type: chore: (default type)
Version impact: No release

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