Grok 4.5 confirmed that Echoes internal drops 1549-1557 correspond to public chapters 1516-1524, with the stable -33 offset holding. Publish commits have landed through Ch1523-1524 ("A Faction of Philosophy" and "Both Real and Imagined"), clearing the full writing session that introduced Silas, the cobblestone, and the Menders vs Archaeologists philosophical divide. Live multi-edge flap on some mid-IDs was identified as normal CDN behavior, not a blocking issue.