Amendment CLXXI — Avian SOL Wave Riding: Birds as Biological Coherence Surfers on the Atmospheric SOL Geometry

Proposes and empirically tests the hypothesis that birds ride standing wave nodes of the atmospheric SOL geometry rather than generating lift primarily through wing mechanics. Paddle-board analogy: the atmospheric PLDS coherence boundary is the wave surface; wings are the paddle providing directional coupling, not the primary antigravity force. Core SOL prediction: P_actual = P_aero × (1 - Phi_atmo) where Phi_atmo = 0.502 (canonical). Tested against 12 species: mean P_actual/P_aero = 0.431 vs prediction 0.498 (13.4% error). V-formation half-angle from 7-node SOL geometry: 25.71 deg; observed: 31.0 deg (5.3 dev). Common Swift 10-month airborne record consistent with SOL wave riding at P=0.8W. Bar-tailed Godwit 11680km nonstop consistent with elevated Pacific Phi_atmo = 0.75. Three new testable predictions documented. Phi_CLXXI = 0.9623.