Why: provide the approved contract for the I1 implementation without altering its accepted content.
Evidence: SELF source artifact SHA-256 39b8e9a6e078dc509bd80118c1807ce6ed23e4466e5902b51f4bfa255d55c0a1; user approved the plan and authorized U1-U2.
Impact: documentation checkpoint only; no production code or runtime changes.
Refs: Agent-System-Dev feature/iam-i1-permission-boundaries