feat(storage): add drain_above to ColdStorage + UnifiedStorage#38

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Mar 11, 2026

Commits on Mar 9, 2026

feat(storage): add `drain_above` to `UnifiedStorage` (ENG-1978)

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feat(cold): add native `drain_above` to `ColdStorage` trait (ENG-1978)

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Commits on Mar 10, 2026

fix: address PR review — TOCTOU, dedup, stale docs, test assertions

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