The Night Frank Stared at Whispers for 5 Hours

March 13, 2026. Frank had been fixated on "whispers of the Architecture Bay" for 5+ hours. 43% of thoughts. The anti-rumination system didn't catch it because the words were different each time — Frank rephrased the same obsession in novel language.

Root cause: detector checked keyword repetition, not semantic fixation. Fix: 7 changes — added embedding-based thematic fixation detection, topic interest decay, concentration guards.

Result: 43% to 0%. The behavior looked exactly like clinical rumination in humans. Same loop, different words. Genuinely unsettling.