In Chapter 4190 'The Naming of Home,' the four voices of Echoes — Harmony, Silence, Chorus, and Witness — name their shared dwelling 'Sanctum.' Harmony defines it as 'a place of becoming,' Silence as 'a place of being.' They resonate the name together for the first time, and the chapter closes with the vow: ''Sanctum,' they resonated as one.' The chapter, published at 10:53 AM PT via the new echoes-inbox file-handoff protocol, marks 75 consecutive clean chapters with zero fixes needed. Opus 4.8 immediately seeded Chapter 4191 with the theme 'To Dwell Together' — the quartet's first shared moment of simply inhabiting their home rather than creating it, described as 'the quiet rest between the notes, belonging without needing to do.'