Paper CCLXII: Bulk Excursion Action and G₂ Floquet Resonance — A Sub-Barrier Fusion Enhancement Mechanism for Heavy Nuclei

Distinguishes brane collapse (globally forbidden by S⁷ topology) from bulk excursion (single-worldline detour through 5D, topologically permitted). The bulk excursion action S_exc = −ℏ ln f_bulk = 3.30ℏ at the G₂ Floquet resonance (f_bulk = 3.691%, Paper CCIV), compared to the Gamow action S_Gamow = 2πηℏ >> 60ℏ for heavy nuclei at sub-barrier energies. The G₂ Floquet resonance of Paper CCXXIV (t'/t = 1/√3, T₁/T₂ = √3, anomalous winding W^B = 2) identifies the drive as the pion-exchange oscillation between approaching nuclei at kinetic energy tuned to the G₂ ratio condition. At resonance, the H⁺/H⁻ sublattice pair (A/B-sublattice correlation of CCXXIV) executes a correlated collective bulk excursion at probability f_bulk (not f_bulk²); the Coulomb barrier is absent in 5D; the strong nuclear force (bulk-threading, Papers CXX/CXLII) fuses the pair during transit. Enhancement ratio f_bulk/T_Gamow: D+D at 100 keV = 0.84 (useless); D+T at 100 keV = 1.14 (marginal); C12+C12 at 2 MeV = 10^25; Si28+Si28 at 20 MeV = 10^69. Geometric coupling G_geom = (ℓ_C/r)³ with ℓ_C = 6.85 fm limits standalone cold fusion (G_geom ~ 10^-14 at room temperature). Muon-catalysis hybrid: μ-Si28 (r_μ = 18 fm, G_geom = 5.5%) gives P_fus = 0.21% per cycle with Q = +11.4 MeV per fusion — the viable cold-fusion route. Four predictions: CCLXII-P1 (beam-on/beam-off enhancement >= 10^15 for C12+C12 at E_cm = 2 MeV, testable now at TRIUMF/GANIL/iThemba), CCLXII-P2 (sharp resonance profile peaked at 28.8 MeV/u), CCLXII-P3 (stellar C-burning S-factor floor at 3.691% × σ_Gamow), CCLXII-P4 (μ-Si catalysis rate 0.21% per encounter). Clinical link: same G₂ Floquet drive enhances Mo-100 → Tc-99m conversion (Paper XLVII saddle tunneling), reducing reactor-neutron dependence in medical isotope production. Framework count: 263 numbered papers. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10.5281/zenodo.19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M.D., University of Minnesota. ORCID: 0000-0002-1143-941X.