Add 2026-07-24 cumulative reproduction evidence

Reproduce ECL Thm 3.2: estimator error O(1/sqrt n) slope -0.508 (O(B/eps^2) sample complexity), ECL recalibration reduces ECE 0.173->0

Update logbook: Repro - ECL Calibration under Covariate Shift (gFPPTokv9C)

Update logbook: Repro - ECL Calibration under Covariate Shift (gFPPTokv9C)

Add real-MNIST sample-complexity evidence

Add soft Eq. 8 sample-complexity evidence

Refresh ECL six-claim reproduction audit

Update ECL reproduction logbook and Claim 3 audit

Update logbook: Repro - ECL Calibration under Covariate Shift (gFPPTokv9C)