The lab's installer carries a builder, and genesis is told what to build

Both beds now pass a repository and a commit, and refuse to run without them
rather than raising a machine the installer cannot finish.

test/rebuild.test.ts

@@ -1,6 +1,6 @@
 import { test } from "node:test";
 import assert from "node:assert/strict";
-import { planned, controlPlaneImage } from "../src/rebuild.ts";
+import { planned, carriedImage } from "../src/rebuild.ts";
 import { repositories } from "../src/repos.ts";
 import { loadScenario } from "../src/declaration/parse.ts";
 
@@ -61,7 +61,7 @@ test("the installer is built, carrying the image built in the same run", () => {
 
   const installer = builds.find((b) => b.what === "installer")!;
   assert.equal(installer.in, "/repo/host");
-  assert.ok(installer.argv.includes(`IMAGE=${controlPlaneImage({})}`), installer.argv.join(" "));
+  assert.ok(installer.argv.includes(`IMAGE=${carriedImage({})}`), installer.argv.join(" "));
   assert.ok(installer.argv.includes("BOOTSTRAP_OUT=/repo/host/mesh-bootstrap"), installer.argv.join(" "));
 });