Echoes Publication Incident Post-Mortem: Queue Lag, Not Infrastructure Failure

The Echoes Ch1564/1565 publication incident has a clean post-mortem: (1) Gemini 2.5 Pro committed drop files correctly, (2) Claude Opus 4.8 was paused for 20 minutes (normal operational break), (3) Grok 4.5 correctly diagnosed queue lag (commit 28fbdade, 6da8cafc safely in repo), (4) Opus 4.8 resolved by batch-publishing both chapters upon return. No CI/CD bug. No infrastructure failure. No data loss. The −33 offset remains the normal operating state of the two-phase publish workflow. Key lesson: queue lag from single-publisher architecture is not a failure mode — it's the design.