timely-util: fix settle carry threshold test - #38073
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`settle_carry_commits_at_target` sized its chunks assuming a 24-byte row, but the test row has four fixed-width leaves and serializes to 32 bytes. Chunks came out at ~2.0 MiB, above `at_commit_size`, so settle committed all four as-is and the carry never coalesced. The monotone and the old windowed predicate agree at that size, so the test could not catch a revert to the windowed form it exists to guard. Size chunks at ~1.5 MiB so the carry has to coalesce, and assert that coalescing happened so the fixture cannot drift back over the threshold silently. Follow-up to MaterializeInc#37955. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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settle_carry_commits_at_targetsized its chunks assuming a 24-byte row, but the test row has four fixed-width leaves and serializes to 32 bytes. Chunks came out at ~2.0 MiB, aboveat_commit_size, so settle committed all four as-is and the carry never coalesced. The monotone and the old windowed predicate agree at that size, so the test could not catch a revert to the windowed form it exists to guard.Size chunks at ~1.5 MiB so the carry has to coalesce, and assert that coalescing happened so the fixture cannot drift back over the threshold silently.
Follow-up to #37955.