OMP Domain Profile: Legal AI Supervision Under ABA Model Rule 5.3 and California Senate Bill 574

This document defines a domain profile of the Operating Model Protocol (OMP) for legal AI deployments subject to attorney supervision obligations under ABA Model Rule 5.3 Responsibilities Regarding Nonlawyer Assistance and California Senate Bill 574 (SB 574, effective January 1, 2026). These instruments impose principal accountability requirements on attorneys who use AI tools to assist with legal work product -- requiring attorneys to verify AI-generated material, ensure compliance with professional duties, and maintain evidence of supervision. This profile specifies how OMP's deterministic routing invariant, Watchtower enforcement framework, and three-layer cryptographic integrity architecture satisfy the attorney supervision obligations imposed by Rule 5.3 and SB 574, and defines the domain-specific Watchtower configurations, Named Accountable Officer assignments, and Audit Trace schema extensions applicable to legal AI deployments. The profile is designated the CiteGuard profile. The OMP core specification is defined in a separate Internet-Draft.