Unified admissibility operator binding invariant budget, drift, topology, biological load, and path termination.

Composite admissibility operator encoding invariant budget, drift constraint, and topology trigger. Traversal defined by 𝒩(x_t) = 𝒜 ∩ 𝓡(x_t). Return governed by Φ(x) → 0 as Σ ↓ and K_auto ↑. Termination: † = path halts, field persists.