Task 63280816169

refactor: add overflow-safe `CeilDiv` helper and use it in unsigned callsites

2026-02-11 17:18:36 completed l0rinc/ceildiv-utxo-flush-gib 02d047fd5b93d96f159db2b8e95fc39450505159

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[meta] determine runners

l0rinc/ceildiv-utxo-flush-gib