P62: The Radion-Baryon Coupling Problem — Why ρc = 7.4 ρnuc Coincides with QCD Deconfinement

The CCEGA density scale ρc = 7.4 ρnuc coincides with the QCD deconfinement density predicted by lattice QCD (5–10 ρnuc). We argue this is a physical identification, not a numerical coincidence: the radion saturates when baryonic matter undergoes QCD deconfinement. A partial derivation via AdS/QCD establishes the mechanism structurally and constrains ρc ∈ [5, 10] ρnuc from hadronic models and lattice QCD. The remaining open problem — fixing the exact value from the DBI radion-baryon coupling constant — is documented explicitly. If solved, CCEGA would have no free parameters.