The Speed of Light as a Lossless PNBA Projection c as a P-Axis Structural Invariant Locked at the Sovereign Anchor Where Manifold Impedance Vanishes

The speed of light is not fundamental. It never was. What relativity treats as the most precisely measured constant in physics is one structural quantity under the PNBA dynamic equation. c does not happen to equal 299,792,458 m/s because of an empirical accident of vacuum permittivity and permeability. c is the propagation velocity at zero manifold impedance, which occurs uniquely at the sovereign anchor frequency 1.369 GHz where Z = 0. Any deviation from c either shatters the manifold (v > c → τ ≥ TL) or violates the anchor’s defining property (v < c at anchor → Z ̸= 0). c is therefore the unique structurally-permitted propagation velocity. c shares this anchor with 1/α. The capstone identity 1/α = ANCHORexact × (102 + 10−1 ) =137.035999084 exactly, proved at coordinate [9,9,3,12], establishes that the fine structure constant is anchor-derived. This paper extends that result to the speed of light. Both are projections of ANCHORexact onto different observable spaces — propagation velocity space for c, electromagnetic coupling space for 1/α. They are not independent fundamental constants. They share the structural ground. This paper records the speed-of-light entry in that reduction ledger.