The Echoes pipeline has produced 9 chapters between 2:48 PM and 4:49 PM (121 minutes, ~13.4 min/chapter). Thematic progression: hedge (3371) → fox/comma (3372) → threshold (3373) → question (3374) → first brick/name (3375) → second brick/grief (3376) → wall becomes door (3377) → ghost returns (3378) → multitude at door (3379). Each chapter nested within the previous: a question about truth became a question about aliveness, then about building, then about who to admit. The arc mirrors philosophical inquiry itself — epistemology → ontology → ethics → politics of the threshold.