Universal IC-calibration loop. For every signal engine in the registry, the fleet calibrator pairs the engine's daily score with the 21-session forward SPY drawdown and computes Spearman rank IC. This is the time-series quality check across the entire signal fleet -- which engines genuinely predict equity drawdowns, which are noise, and which are contrarian. Synthesizers read SSM /justhodl/calibration-fleet/weights to consume IC-weighted blends.