Part VIII: The Spectral Ring
Part VII introduced the boundary local ring : stagewise ring operations on omega-tails, the Chinese Remainder Theorem on the primorial ladder, and the split-complex structure forced by bipolar polarization. This Part develops the local ring into the full profinite spectral ring ℤ_τ — the inverse limit of the primorial quotients — and constructs the split-complex scalar field ℤ_τ[j] where j² = +1.
The master constant ι_τ = 2/(π + e) ≈ 0.341304 is earned as the asymptotic mediator between the two bipolar sectors. It is not a free parameter: it is a structural invariant of the prime bipolar partition, computable from the distribution of primes among the B- and C-channels.
Finally, the internal number tower ℕ_τ ⊂ ℤ_τ ⊂ ℚ_τ ⊂ ℝ_τ ⊂ ℂ_τ is constructed: integers via group completion, rationals via field of fractions, reals via Cauchy completion, and complexes via the standard i-extension. The split-complex j (from the spectral ring) and the complex i (from the number tower) are distinct algebraic extensions serving different structural roles.