Give the module the broker it asks for, rather than a module that asks for nothing

The mesh refused to place amqp-ping: nothing provides amqp. That refusal is
right. The substrate raises a broker, but as a bundle resource — plumbing, not a
module the mesh has a record of — so it offers nothing to anything, and a module
wanting a broker wants one in the graph.

lavinmq is that module and needs no building, its image being upstream, so this
is a register and an assign. The alternative was to pick a module with no
requires, which would have passed by testing less.

Also: the control plane's image has no /tmp to copy a manifest into. Root does.

Claude-Session: https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx

test/integration/fresh-mesh.test.ts

@@ -67,6 +67,16 @@ const REGISTRY = `${ANCHOR}:5000`;
  * under test (novox/hq SELF-UPGRADE-PLAN, rule 1).
  */
 const BASE = { module: "mesh-tools", repo: "mesh-tools", path: "" };
+/**
+ * What `amqp-ping` requires, and what the substrate does not supply.
+ *
+ * The installer raises a broker, but as a bundle resource — plumbing, not a module the mesh has a
+ * record of, so it provides nothing to anything. A module asking for `amqp` is asking for a
+ * provider in the graph, and this is it. No build: its image is upstream.
+ */
+const PROVIDER = { module: "lavinmq" };
+/** Named once, because the step title is also how later steps say what they waited on. */
+const NEEDS = "the mesh runs a broker for that module to talk to";
 const MODULE = { module: "amqp-ping", repo: "mesh-catalog", path: "modules/amqp-ping" };
 
 const capability = await labIsUsable();
@@ -146,13 +156,17 @@ async function mesh(command: string, timeoutMs?: number): Promise<string> {
  * Pushing the manifest to the machine and naming that path got `no such file or directory` from
  * inside mesh-control, which is correct and was briefly mistaken for a missing manifest. It is
  * copied the last step of the way with `docker cp`.
+ *
+ * **Into the root, not into /tmp.** The control plane's image is a minimal one and has no `/tmp`
+ * to copy into — `docker cp` says so in those words. `/` is the one directory every image has.
  */
 async function registerModule(module: string, manifest: string): Promise<string> {
   assert.ok(existsSync(manifest), `no manifest for ${module} at ${manifest}`);
   const onMachine = `/tmp/${module}.json`;
+  const inContainer = `/${module}.json`;
   await push(instanceId, CONTROL, manifest, onMachine);
-  await must(CONTROL, `docker cp ${onMachine} mesh-control:${onMachine}`);
-  return mesh(`module add ${onMachine}`);
+  await must(CONTROL, `docker cp ${onMachine} mesh-control:${inContainer}`);
+  return mesh(`module add ${inContainer}`);
 }
 function tokenFrom(said: string): string {
   const found = said.split("\n").map((l) => l.trim()).find((l) => l.length > 100 && !l.includes(" "));
@@ -297,12 +311,36 @@ before(async () => {
     return `${built}\n${builds}`;
   });
 
+  // ---- 4b. WHAT THE MODULE NEEDS --------------------------------------------------------------
+  //
+  // `amqp-ping` requires the `amqp` provision, and the mesh refused to place it: "nothing provides
+  // amqp, wanted by amqp-ping". That refusal is correct and is the reason this step exists rather
+  // than the reason to pick an easier module. **The substrate's broker is not a provider.** It is
+  // raised by the installer as part of the bundle, so it is a running container and not a module
+  // with something to offer — the mesh's own plumbing, not an entry in its graph. A module that
+  // wants a broker wants one the mesh knows about.
+  //
+  // `lavinmq` is that module, and it needs no building: its image is upstream, so this is a
+  // register and an assign, and it is a fair test of provisioning rather than of building.
+  await step(NEEDS, "the mesh builds a module standing on that base", async () => {
+    await registerModule(PROVIDER.module, resolve(catalogDir, PROVIDER.module, "module.json"));
+    await mesh(`assign ${CONTROL} ${PROVIDER.module}`);
+    await mesh(`push ${CONTROL}`, 600_000);
+    for (let i = 0; i < 60; i++) {
+      const ps = (await on(CONTROL, `docker ps --format '{{.Names}}\t{{.Status}}'`)).out;
+      const line = ps.split("\n").find((l) => l.includes(PROVIDER.module));
+      if (line && /Up /.test(line)) return ps;
+      await new Promise((r) => setTimeout(r, 5_000));
+    }
+    throw new Error(`${PROVIDER.module} never came up on ${CONTROL}:\n` +
+      (await on(CONTROL, `docker ps -a --format '{{.Names}}\t{{.Status}}'`)).out);
+  });
+
   // ---- 5. THE ANCHOR RUNS IT ------------------------------------------------------------------
   //
   // The machine that built it. This is the case every earlier proof covered, and it is here as the
   // control for step 6: if this fails, step 6's failure says nothing about fetching.
-  await step("the anchor runs the module the mesh built",
-    "the mesh builds a module standing on that base", async () => {
+  await step("the anchor runs the module the mesh built", NEEDS, async () => {
     await mesh(`module issue ${MODULE.module} --node ${CONTROL}`).catch(() => {});
     await mesh(`assign ${CONTROL} ${MODULE.module}`);
     await mesh(`push ${CONTROL}`, 600_000);
@@ -362,6 +400,7 @@ for (const name of [
   "three machines join it across the household gateway",
   "the mesh builds the shared base from source",
   "the mesh builds a module standing on that base",
+  NEEDS,
   "the anchor runs the module the mesh built",
   "a joined machine runs the module the mesh built",
 ]) {