Timeseries neighbor average nan interpolation
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- **wenmin-wu/timeseries-neighbor-average-nan-interpolation**: Fill gaps in a daily exogenous series (oil prices, sensor feeds) by merging against a full calendar to expose NaNs, then replacing each NaN with the midpoint of its nearest valid left and right neighbors, walking outward past consecutive NaN runs Read `references/wenmin-wu/skills/timeseries/neighbor-average-nan-interpolation/SKILL.md`.
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