$ python3 verify_multisource.py
multi-source verification: VERIFIED_MULTI_SOURCE  (5 independent implementations)
  VALID    verify_all.py                                        every claim + artifact, from all 3 sites
  VALID    verify_authority_bundle.py (session A)               the L5 authority bundle (AgentIdentity/AuthorityGrant/DelegationGrant/Decision)
  VALID    verify_authority_bundle_engine_b.py (session B)      the L5 authority bundle (AgentIdentity/AuthorityGrant/DelegationGrant/Decision)
  VALID    verify_l5_bundle.py                                  the L5 evidence bundle (authority root, autonomous autonomy)
  VALID    verify_multisource.py (this driver, own implementation) signed claims registry: cross-site identity + Ed25519 over registry_digest
  third party: False  (same operator; not a certification)