A lawyer must keep confidential everything relating to a client's representation, whatever its source, unless the client gives informed consent to disclosure, disclosure is impliedly authorised to carry the representation forward, or one of the rule's own exceptions in subsections (b), (c) or (d) applies. The duty survives the end of the relationship.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.