Deriving Planck's Constant from Hydrogen Atom Geometry

I derive Planck’s constant from the geometry of the hydrogen atom, achieving 0.018%agreement with CODATA. The derivation rests on a single postulate—that the hydrogenground state is one radian of a natural energy quantum—motivated by the telescoping seriesover atomic transitions. A geometric interpretation of the fine structure constant refines theresult but does not affect the principle. The result demonstrates that h is not an independentfundamental constant but a geometric consequence of atomic structure.