One Photon Across the Spectrum: Consistency of a Single Constituent-Mass Coordinate and the Measurements That Can Test It

Status: Conditional multi-channel reconstruction completed; prospective same-target confirmation locked. Under the frozen mapping (ΔtH = 2 s) the primary-standard force balances return M = (1.848 ± 0.007)×10−51 kg from seven signed comparisons and (1.850 ± 0.006)×10−51 kg from nine apparatus. The non-resonant torque record, reduced with one fixed Spin-transfer length, returns an out-of-sample (1.864 ± 0.258target)×10−51 kg (± 0.789 with the 852 nm anchor uncertainty propagated; 1.877 ± 0.246 with the length fixed at the crossover λ* = 1000 nm), and it already discriminates the wavelength law: the octave ratio is 1.39 ± 0.19, 0.13σ from √2 and 3.2σ from 2. The preregistered same-target dual-wavelength ratio converts this record into an extraction that needs no external length anchor. A beam of light is treated as an accumulation of rays, each ray composed of constituent photons, the smallest units of light. Two elementary identities applied to a finite ray fix one wavelength-independent constituent mass, M = h/(2c^2 dt_H) = 1.84312e-51 kg. The paper compares this fixed value with published measurements across atomic recoil, matter waves, X-rays, radiation-pressure metrology, liquids and optical torque, and states a frozen prediction for the decisive same-target dual-wavelength torque measurement. No new experiment has been performed. Force and torque numbers are reconstructions from published data; the same-target dual-wavelength measurement decides.