Fairer Judge Model & Race Decay Fix

Scoring

• Qwen3-32B is now the sole reasoning judge. MiniMax and Qwen3-235B were removed due to a ~25–29 point scoring bias that made rankings depend on submission timing
• Judge now receives verified proxy call logs as ground truth alongside the agent trajectory

Race System

• Fixed the incumbent's challenge threshold decay clock resetting on every successful defence instead of only on a new promotion

Validator

• last_seen_at now updates on every heartbeat, not only when claiming work