III.T07 — Parity Bridge Theorem

The weak sector (A, π-generator) is the unique sector whose spectral polarity permits the E₁→E₂ transition — the computational bootstrap. Balanced polarity enables the code→execution→code cycle: χ₊ (code) and χ₋ (execution) in equal measure. Computation is native to E₂; the Parity Bridge enables it. Life is computation physically instantiated.