Sprint 6a — Backend T2 Live (WS proxy + correction + persistance)
feat(geminiLive): dynamic prompt builder, transcript accumulation,
VAD config (END_SENSITIVITY_LOW, 2s silence), 210s timeout + 180s warning
feat(t2live): sujet fetch + validation, correction pipeline (deepseekCorrectEO
+ PHONOLOGY_STUB TD-08), production insert + report delivery via WS
feat(deepseek): TacheEO extended with EO_T2, VALID_TACHES_EO updated
test: 11 geminiLive tests (rewritten + 4 new), 10 t2live integration tests
292/292 backend tests green (+15)