Resolving the cosmological lithium problem from K4 geometry

The 40-year cosmological lithium problem — standard Big Bang Nucleosynthesis overpredicts primordial ⁷Li/H by a factor ~3.3 — is resolved by a geometric suppression factor from the K4 tiling of S². Lithium-7
   production proceeds through ⁷Be (A = 7 = 4 + 3), whose structure is an α particle (complete K4, 4 nucleons on 4 vertices) plus a ³He fragment (3 nucleons on an incomplete second shell). Only the exposed
  fraction 3/7 feels the ambient void pressure, yielding the void-lean factor f = (7π² − 3)/(7π³) ≈ 0.3045. The corrected abundance ⁷Li/H = 1.60 × 10⁻¹⁰ matches the Spite plateau to −0.1% with zero free
  parameters. D and ⁴He predictions remain consistent with observation (+0.2% and +0.5%). No new physics, no stellar depletion, and no fitted parameters are required. This is a companion paper to the main BCCF
   framework (doi:10.5281/zenodo.18874865).