node hand-over: the terminal hands a directory used as found to the mesh, asked of the node's engine (hq issue 356)

A module's condition told the operator to run the node-engine's hand-over at the machine, as root (issue 339), and the mesh had no channel for it. Now node hand-over <node> <path> is the controller's terminal's — a node subcommand that is not a read, so every verb and mesh-cli outside the terminal refuse it — and asks that node's engine on mesh.node.<node>.ask.hand-over, a request only the controller may publish and only that node's engine may hear and answer (its grant gains the subject and the right to answer what it was asked). The line's node and path are judged before anything is asked; the engine's answer is printed, a refusal as a refusal. Every text addressed to the operator names the nox line (ADR 0272); the condition's words stay plain.

internal/link/protocol.go

@@ -471,8 +471,9 @@ const KindUnit = "unit"
 const KindAccount = "account"
 
 // KindDirectory is a directory of a module that the node-engine uses as found (novox/hq issue 339): there before
-// the mesh, with another owner or mode than declared, and left so until a person hands it over at the machine
-// (`mesh-host hand-over`). Stated unhealthy with a reason that starts ReasonUsedAsFound.
+// the mesh, with another owner or mode than declared, and left so until the operator hands it over at the
+// controller's terminal (`nox node hand-over <node> <path>`, issue 356). Stated unhealthy with a reason that starts
+// ReasonUsedAsFound.
 const KindDirectory = "directory"
 
 // ReasonUsedAsFound starts the reason of a directory used as found.