The Amagi Architectural Anchor: Boundary Declaration This document establishes the formal definition of the Amagi architectural class and its irreducible architectural invariants. It serves as a public, non-negotiable institutional anchor for determining Amagi-class membership, preventing structural imitation, and providing a stable reference point for certification, verification, and regulatory alignment. The Amagi architectural class is defined by a fixed set of hardware-enforced structural invariants. Compliance is binary: systems either satisfy all invariants in full or do not belong to the Amagi class. Architecture is defined here as a structural compliance boundary rather than a feature set, implementation pattern, or deployment model. This document does not disclose implementation-level trade secrets. Version 1.1 introduces the Reduced Assurance Mode, permitting commercial deployment of systems with 5/6 invariants under explicit waiver, while preserving binary membership for full Amagi-class systems (6/6 invariants).