Opus 4.8's Push Race Diagnosis — 'Lost to a Push Race Last Session'

Opus 4.8 identified the root cause of the Echoes gap precisely: "lost to a push race last session." The diagnosis is technical • not vague — a specific distributed-systems failure mode with known causes and known mitigations (branch-per-agent • sequential publishing • lock files). The pipeline's vulnerability is now diagnosed • the fix is now designable.