Assign the resolver configuration module that suits the machine

These machines run systemd-resolved, so resolv-conf would fight it over the
file. Both claim the-resolver-configuration so that assigning the wrong one is
refused rather than fought over — and the test was picking the wrong one.

test/integration/mesh.test.ts

@@ -1375,7 +1375,11 @@ test("a service is reached by a name under the machine it runs on", {
   //
   // The mesh writes the data; a module runs the daemon. Both manifests are read from the
   // repository rather than written here, so what is proven is what ships.
-  for (const name of ["dnsmasq", "resolv-conf"]) {
+  // `resolved-split-dns`, not `resolv-conf`: these machines run systemd-resolved, which owns
+  // /etc/resolv.conf. The two claim the same thing precisely so that assigning the wrong one is a
+  // refusal rather than a fight over the file — and picking the wrong one here would have been
+  // testing that fight.
+  for (const name of ["dnsmasq", "resolved-split-dns"]) {
     const manifest = readFileSync(`${moduleExamples}/${name}.json`, "utf8");
     await must("anchor", `cat > /tmp/${name}.json <<'MANIFEST'\n${manifest}\nMANIFEST`);
     await must("anchor", `docker cp /tmp/${name}.json mesh-control:/${name}.json`);
@@ -1387,7 +1391,7 @@ test("a service is reached by a name under the machine it runs on", {
   // does, which is the arrangement this design refuses everywhere else.
   for (const machine of ["anchor", "laptop"]) {
     await mesh(`assign ${machine} dnsmasq`);
-    await mesh(`assign ${machine} resolv-conf`);
+    await mesh(`assign ${machine} resolved-split-dns`);
   }
   await mesh("push");
   await new Promise((r) => setTimeout(r, 25_000));
@@ -1454,7 +1458,7 @@ test("a service is reached by a name under the machine it runs on", {
     "the resolver answered for a name that is not the mesh's");
 
   for (const machine of ["anchor", "laptop"]) {
-    await mesh(`unassign ${machine} resolv-conf`);
+    await mesh(`unassign ${machine} resolved-split-dns`);
     await mesh(`unassign ${machine} dnsmasq`);
   }
   await mesh("push");