Operating Model Protocol (OMP) Core: Invariant 3 -- Verifiable Delegation Binding

This document obsoletes draft-veridom-omp-00. The Operating Model Protocol (OMP) defines a deterministic routing and tamper-evident evidence architecture for consequential AI decisions. This document specifies OMP Core, which adds Invariant 3: Verifiable Delegation Binding. Every ASSISTED or ESCALATED routing state must bind the Named Accountable Officer to a verifiable DelegationInstrument at the time of decision. When valid binding cannot be established, the system records AUTHORITY_UNBOUND -- a sealed, positive evidentiary state. This update is additive and backward-compatible with OMP Core version 00.