Assert the build was recorded, not that the word appears

`builds` says "nothing has been built yet" when there is nothing, and the
assertion was matching on a word that sentence contains.

test/integration/mesh.test.ts

@@ -681,6 +681,10 @@ test("the builder is a module the mesh assigns, with a credential the mesh deliv
     `git -c user.email=lab -c user.name=lab commit -qm built`);
   await mesh("build /root/built --wait 300s", 420_000);
 
-  assert.match(await mesh("builds"), /built/,
+  // Naming the module, and not merely containing its name: `builds` says "nothing has been built
-    "the build was accepted and no build was recorded against the module");
+  // yet" when there is nothing, and that sentence contains the word this was matching on.
+  const recorded = await mesh("builds built");
+  assert.doesNotMatch(recorded, /nothing has been built/,
+    `the build was accepted and no build was recorded against the module:\n${recorded}`);
+  assert.match(recorded, /built/, recorded);
 });