Why: Success-shaped receipts and caller-writable history must not authorize apply/admit without controller-originated provenance.
Evidence: Fabricated, unsigned, tampered-history, and moved-ref tests were RED before HMAC binding; 52 controller/history/admission tests now pass.
Impact: Stores a local 0600 attestation key, signs successful history including transport commit SHA, and verifies it before apply/admit.
Refs: independent Codex review of feature/agent-cli-enforcement