The machine's own resolver is a node seat, and the uplink steps back from the resolver file where it is held (hq ADR 0247)

A machine with a VPN client that writes /etc/resolv.conf needs its domains
routed to the VPN's servers while every other name still goes to the mesh's
resolvers. node-resolver's holder does that on the machine, owns the resolver
file there, and serves routes, route and unroute. The uplink's holder steps
back from the file only where the resolver is held; every other machine
composes as before.

internal/catalogue/seats_test.go

@@ -46,7 +46,7 @@ func TestTheSeatsAreAClosedSetAndEachNamesItsDecision(t *testing.T) {
 			delivered[s.Delivers] = s.Name
 		}
 	}
-	// Thirty-seven with mesh-delivery (novox/hq ADR 0239); thirty-six since node-resolver-config retired
+	// Thirty-eight with node-resolver (novox/hq ADR 0247); thirty-seven with mesh-delivery (novox/hq ADR 0239); thirty-six since node-resolver-config retired
 	// into node-uplink (novox/hq ADR 0223); thirty-seven
 	// since the retired node-dns-resolver went (novox/hq ADR 0220); thirty-eight with
 	// node-backup (novox/hq ADR 0214); thirty-seven with node-message-bus (novox/hq ADR 0215);
@@ -57,8 +57,8 @@ func TestTheSeatsAreAClosedSetAndEachNamesItsDecision(t *testing.T) {
 	// node-container-runtime (ADR 0207); nineteen with node-environment and node-login-shell (ADR 0203,
 	// ADR 0204); seventeen with node-build-agent (ADR 0190). One fewer once the retired
 	// mesh-build-machine row goes, when no registered manifest claims it.
-	if len(Seats()) != 37 {
-		t.Errorf("the mesh defines %d seats rather than 37; the set is closed, so a change here is "+
+	if len(Seats()) != 38 {
+		t.Errorf("the mesh defines %d seats rather than 38; the set is closed, so a change here is "+
 			"a decision (novox/hq ADR 0110): %s", len(Seats()), seatNames())
 	}
 }