Lőrinc 02d047fd5b refactor: add overflow-safe CeilDiv helper ...

Introduce `CeilDiv()` for integral ceiling division without the typical `(dividend + divisor - 1) / divisor` overflow, asserting a non-zero divisor.

Replace existing ceiling-division expressions with `CeilDiv()` to centralize the preconditions.

Add unit tests covering return type deduction, max-value behavior, and divisor checks.

2026-02-11 18:18:21 +01:00

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