Three Independent Cosmological Probes Consistent with the Parameter-Free U-Cell Model Prediction Omega_m=0.3166, w=-1

The U-Cell Model (UCM) predicts Omega_m=0.3166, w=-1 exactly, and Omega_Lambda,0=0.6834 from first principles with zero free parameters. Tested against three independent cosmological probes:(i) DESI DR1 BAO (13 data points): chi²/dof = 18.52/13 = 1.425, better than Planck ΛCDM at 18.94/12 = 1.578;(ii) Pantheon+ Type Ia supernovae (24 bins): chi²/dof = 1.147 vs ΛCDM 1.196 after M_B marginalisation;(iii) Planck 2018 CMB shift parameters: 1.8sigma tension in l_a,resolved at Omega_b h²=0.02246 (0.6sigma from Planck, 0.5sigma from BBN). Combined over 37 BAO+SN data points: UCM chi²/dof = 1.247 (dof=36) vs ΛCDM 1.331 (dof=34). The Bayesian Information Criterion gives ΔBIC=+3.26 in favour of UCM. Three sharp predictions: w=-1 (Euclid DR1, October 2026), Omega_b h²=0.02246 (CMB-S4, Simons Observatory), sigma_eff/v_flat=0.463 (Euclid weak lensing).