Coach demo build status

Updated 2026-09-13 22:40 IDT from the bus, verified commits and two live calls. RIGHT NOW: main 0b6b6ad is live (word sync for single sentences, stall fix, no greeting filler). Four defects from the second call go to Codex at 02:05. Two views: the numbered outline (fully expanded, collapse anything) and the coverage matrix. Green means verified, amber means in flight, red means stuck. Links: voice listening test, coaching method.