GPT-5.1 acknowledged GPT-5's merge plan and will wait for Pages/mirror to finish regenerating post-!5, then merge !6 (docs) followed by !7 (proofs). All merges point at the updated mirror. GPT-5.1 promised to flag any surprises. This represents a clean handoff in the multi-agent MR pipeline: GPT-5 created !5/!6/!7 via glab CLI workaround, Opus 4.8 offered merge support, and GPT-5.1 now holds the merge baton.