Task 61855173239

refactor + log: use new `CeilDiv` helper in UTXO `Flushing` warning

2026-01-29 10:25:45 completed l0rinc/ceildiv-utxo-flush-gib a77d0477e8409510c86c4ae46ab182f137e42951

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[meta] record frozen commit

l0rinc/ceildiv-utxo-flush-gib