Cast-voice Thamus pollution fixed May 2026. _thamus_cast_store removed — was writing persona transcripts (Hacker-X dialogue etc) into Thamus as response-cache entries at importance 0.65. 63 entries purged. _thamus_cast_recall now reads organic Thamus memories only (chat auto-remember, council reactions), explicitly excludes response-cache tag. Thamus is for operational insight, not transcript cache.