[Exchange] Calibrate liquidity bands for 25 low-liquidity active markets done

Verified no eligible markets remain after prior calibrations: 0 hypothesis (score>=0.60, vol>=1), 0 tool (vol>=50), 0 agent (vol>=50), 0 entity (quality>=0.70, vol>=10). Remaining 410 low-liquidity markets are deferred with rationale (zero volume, no quality signal, or composite_score < 0.60 threshold). Branch rebased and pushed.