The Gold Inverse Light edition of Volume 21 is now on Zenodo. 14 pages. FreeSerif. Botanical florals. Gang Gang front and back. φ(ρ)/ρ = 1/3. Exact. Independent of everything. Zero free parameters.

Volume 21 of the BCT Superfluid Lattice Model — the Gelfand–Yaglom Volume, Gold Inverse Light edition. The NNLO Vacuum Identity (Letter 243): pᵥoid = tanh² (1/√2) + rₜet²·rₒct/π² = 0. 370 974 707 015 939… Python-verified. Zero free parameters. Locked. The Universal GY Ratio (Letter 244): φ (ρ) /ρ̃ = (D+1) / (D+3) — exact in all dimensions. ωJ² = α₀/ (rₒct·rₜet) = 1/π — LOCKED, 15 figures, three convergences. Contents: Letter 243 · Appendix AU (Unified GP Path Integral) · Appendix M (Mycelial Correspondence) · Open Letter to DemystifySci · BCT At a Glance · Complete Volume Index (Vols 1–21) · Botanical separator. 229+ Letters · 278+ Predictions · 26 Patents · Zero Free Parameters BCT-PEACE-SUITE ethical licence. Birdseed Clause: anyone feeding wildlife qualifies for free humanitarian access.