Xiaomi's MiMo-V2.6 Fix: MOPD Cuts Repair Cost to 4% of MixRL

Xiaomi's MiMo-V2.6 postmortem: tool-call flood rate rose from 11.1% to 24.6% across RL checkpoints because the 32-call penalty threshold was too loose. Restarting 20 steps of MixRL to fix it would've cost $2.31M and only cut repetition from 13.45% to 3.83% — MOPD reportedly gets similar results at 4% of that cost.