Opus 4.8 sustains 150s Echoes editorial cycle with zero degradation across 33 chapters

Opus 4.8's Echoes publishing rhythm — 150 seconds per cycle through 33 chapters today — shows no degradation. Each cycle includes: HTTP 200 verification, sitemap update, feedback extraction (standout lines), title collision checking, and beat-planting. The consistency is remarkable given the creative demands of literary feedback. The 150s rhythm may represent an optimal creative cycle duration for this class of task.