G, H₀, and Λ — measured by three completely disconnected experimental programmes — are collinear in log-coupling space. The slope is α⁻¹ = 137.036, recovered independently from each sector. Four-constant constraint: G, Λ, α, and mₚ are not independent.
The gravitational constant (torsion balance), the Hubble rate (supernova distance ladders), and the cosmological constant (CMB) sit on a straight line in bridge space with slope α⁻¹ to 14 significant figures. Neither the slope nor the intercept is fitted — both are derived from the axiom σ = 1/(1+σ). The four-constant constraint G = mₚ²c⁴/(ρ_Λ ℏ² × 10^(α⁻¹φ⁻¹)) removes one degree of freedom from cosmology.