fix(imputation): FE-span snap guard on the pretrends lead model#650

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fix/imputation-lead-snap

Commits on Jul 8, 2026

fix(imputation): FE-span snap guard on the pretrends lead model

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test: platform-robust lead-trap assertion (count-based, not horizon-specific)

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test(imputation): assert the full NaN inference tuple on the spanned lead (review P3)

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