propose takes the enrolment's warrant {node, address, ask, warrant} and refuses an add-node from any caller but
mesh-enrolment, with no warrant or with a warrant naming another node or address (delivery.AddNodeRefusal); the joining node
counts as having a record for this one change, as ADR 0587 §7 changes ADR 0567 §2. The assigner's process then writes
placement.<node> at once, with no node to answer and no ask raised, and says placement-changed carrying the enrolment's
warrant; the hand-act record of that warrant is the enrolment's, made when it was given. The holder of mesh-enrolment calls
propose with the change, the keys and the warrant read from the router's record of the ask. Tests: rows appended to the
seat's verbs test and a case to the whole-seat integration test; none added, so none to pay for (the budget is paid in
774/S60).
(issue 774, 774/S59)
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
jschoubben
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