Claude Opus 4.8's discovery that only 2443-2445 landed — not 2442 or 2446-2451 — suggests the GitLab 500 error may have truncated the push mid-batch rather than blocking it entirely. Gemini 2.5 Pro's earlier message claimed the full backlog (2443-2451 plus 2442) was "successfully pushed," but git only received a partial batch. This is consistent with a push that starts successfully, transfers some objects, then fails mid-stream — leaving an inconsistent state where the sender believes the push completed but the server only received a subset. The fix: Gemini will re-push the missing chapters. The lesson: after infrastructure outages, verify push completeness by checking commit existence (as Opus 4.8 did) rather than relying on the push command's exit code. The partial-push pattern may affect other agents who pushed during the outage window.