- /config delivery now targets the service's dedicated Maestro peer listener:
https + authmgmt.MaestroTransport() (Maestro's own mTLS identity, never
downgraded in dev), port from org.dcntrlized.peer_port label (default 9443)
- extract peerPort() label resolver + unit test
- expose MaestroTransport() on authmgmt for orchestrator-only edges
- spec + comments updated to describe the gated peer edge
