Check a merge's place only once it merges; keep the whole patch's order

An offline merge that falls back to a whole write is revision-checked, not
refused for its place. A patch without a merge looks its target page up
after its payload again, so older clients see the errors in the order they
did.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
948e005ddeDara Adedeji committed on 10/10/2026, 6:01:01 AMparentf1a1540

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