diff --git a/scenarios/lavinmq-bed.yml b/scenarios/lavinmq-bed.yml
new file mode 100644
index 0000000..ed9d8fd
--- /dev/null
+++ b/scenarios/lavinmq-bed.yml
@@ -0,0 +1,59 @@
+# Two machines: one is the substrate, the other carries a lavinmq PROVIDER and a consumer of it.
+#
+# lavinmq is the mesh's own control-plane broker (mesh-broker), and it is ALSO offered as a
+# user-facing capability: a module that needs a message queue gets its OWN broker — a scoped vhost and
+# user on a lavinmq PROVIDER — not an account on the control broker. That makes lavinmq the sharp
+# two-node case, for the same reason two-node-db is: the substrate's broker publishes 5672 on the node
+# it runs on, and a lavinmq provider must publish 5672 too for its consumers to reach it — so the two
+# cannot share a machine. The moment a real amqp provider must own a node's 5672, it collides with the
+# control broker already there, and the chain is blocked single-node.
+#
+# This is the split that unblocks it. `anchor` runs the substrate (store, broker, control) and NOTHING
+# else. `laptop` runs the whole chain: the lavinmq PROVIDER and the amqp-ping CONSUMER that requires
+# it. Provider and consumer are co-located on laptop, so the grant never crosses a node boundary; only
+# enrolment crosses to anchor, over the underlay both machines share. And because the substrate broker
+# is on the OTHER node, the provider owns laptop's 5672 uncontested.
+#
+# It needs a host binary and the substrate bundle:
+#
+#   MESH_LAB_HOST_BINARY=.../mesh-host   MESH_LAB_BUNDLE=.../examples/substrate-first-node.lock
+#
+# HELPER — stock the two runtimes into the local daemon before the run (some may already be there):
+#   scripts/build-module-runtime.sh lavinmq   /tmp/lavinmq.tar
+#   scripts/build-module-runtime.sh amqp-ping /tmp/amqp-ping.tar
+# The service image cloudamqp/lavinmq:latest must be in the local daemon too — it is already stocked as
+# the substrate's own broker image; each node pulls what it runs from the scenario's own registry by
+# digest.
+scenario: lavinmq-bed
+
+segments:
+  hosting:
+    kind: public
+    cidr: [192.0.2.0/24]
+
+machines:
+  anchor:
+    at: { segment: hosting, address: [192.0.2.10] }
+    inbound: allow
+    memory: 3GiB
+    cpus: 2
+  laptop:
+    at: { segment: hosting, address: [192.0.2.11] }
+    inbound: allow
+    memory: 3GiB
+    cpus: 2
+
+images:
+  # The first-node substrate: store, broker (itself lavinmq), control.
+  - postgres:17-alpine
+  - cloudamqp/lavinmq:latest
+  - mesh-control:development
+  # The lavinmq provider's runtime (reused for its run-once bootstrap and its provisioner) and the
+  # amqp-ping consumer's runtime, both built by scripts/build-module-runtime.sh into the local daemon
+  # and stocked into the scenario's own registry, which is where the hosts pull them from by digest.
+  # The lavinmq SERVICE image is cloudamqp/lavinmq:latest, already stocked above.
+  - mesh-runtime-lavinmq:development
+  - mesh-runtime-amqp-ping:development
+
+place:
+  all: [host, runtime]
diff --git a/test/integration/lavinmq-bed.test.ts b/test/integration/lavinmq-bed.test.ts
new file mode 100644
index 0000000..44a2ab8
--- /dev/null
+++ b/test/integration/lavinmq-bed.test.ts
@@ -0,0 +1,430 @@
+/**
+ * A lavinmq PROVIDER and a consumer of it ride one node while the substrate's own broker owns 5672 on
+ * another — the end-to-end proof that a module which needs a message queue gets its OWN broker.
+ *
+ * lavinmq is the mesh's control-plane broker AND a user-facing capability: a consumer that requires
+ * `amqp` is given a scoped vhost + user on a lavinmq PROVIDER, not an account on the control broker
+ * (novox/hq ADR 0048). That makes it the two-node case, the twin of two-node-db: the substrate's
+ * broker publishes 5672 on anchor, and a lavinmq provider must publish 5672 for its consumers to
+ * reach it — so the two cannot share a machine. `anchor` runs the substrate and nothing else; `laptop`
+ * runs the provider AND the amqp-ping consumer, co-located, and owns laptop's 5672 uncontested.
+ *
+ * The proof is layered:
+ *   - the provider's run-once bootstrap computed the admin password hash lavinmq needs and wrote its
+ *     config BEFORE the broker started (ADR 0052) — proven because the broker came up at all and is
+ *     gone from `docker ps -a` (a step, not a service);
+ *   - the lavinmq service and BOTH runtimes (bootstrap done, provisioner running) are up and stable;
+ *   - each module got its own scoped broker account on the substrate broker (anchor), named for the
+ *     node that runs it;
+ *   - the provisioner (in mesh-lavinmq on laptop) created the consumer's vhost AND user, both named
+ *     for the login the mesh derived — checked with `lavinmqctl` inside the broker;
+ *   - the consumer was bound its scoped login, and its container connected to that vhost with the
+ *     mesh-minted password and round-tripped a message (published and consumed it back).
+ *
+ * The db-name lesson, applied to AMQP: the consumer uses `${bound:amqp:as}` for BOTH its username and
+ * its vhost — the provider named the vhost after the login — and nothing is hardcoded; the provider's
+ * `serves` carries the port so the consumer references `${bound:amqp:port}`.
+ *
+ *   MESH_LAB_HOST_BINARY=.../mesh-host   MESH_LAB_BUNDLE=.../examples/substrate-first-node.lock
+ *
+ * HELPER — stock the two runtimes into the local daemon before the run (some may already be there):
+ *   scripts/build-module-runtime.sh lavinmq   /tmp/lavinmq.tar
+ *   scripts/build-module-runtime.sh amqp-ping /tmp/amqp-ping.tar
+ * cloudamqp/lavinmq:latest must be in the local daemon too (it is the substrate's own broker image);
+ * scenarios/lavinmq-bed.yml stocks all of them, and each node pulls what it runs by digest.
+ */
+
+import { test, before, after } from "node:test";
+import assert from "node:assert/strict";
+import { existsSync, readFileSync } from "node:fs";
+import { loadScenario } from "../../src/declaration/parse.ts";
+import { raise } from "../../src/lifecycle/raise.ts";
+import { destroy, exec } from "../../src/lifecycle/operate.ts";
+import { hostBinaryPath, HOST_PATH } from "../../src/lifecycle/place.ts";
+import { labIsUsable, destroyAll } from "./harness.ts";
+
+const capability = await labIsUsable();
+const binary = hostBinaryPath();
+const bundle = process.env["MESH_LAB_BUNDLE"] ?? "";
+
+const skip = !capability.usable
+  ? `lab not usable: ${capability.why}`
+  : !binary || !existsSync(binary)
+    ? "MESH_LAB_HOST_BINARY is not set to a built mesh-host"
+    : !bundle || !existsSync(bundle)
+      ? "MESH_LAB_BUNDLE is not set to a substrate bundle (mesh-host examples/)"
+      : false;
+
+const SCENARIO = "lavinmq-bed";
+/** The node that carries the provider and its consumer. anchor carries only the substrate. */
+const NODE = "laptop";
+/** The login the mesh derives for the consumer: mesh_<node>_<slug> (slug "ping"; ADR 0049). */
+const CONSUMER_LOGIN = "mesh_laptop_ping";
+
+let instanceId = "";
+let stocked: string[] = [];
+
+function quote(s: string): string {
+  return `'${s.replaceAll("'", `'\\''`)}'`;
+}
+
+async function on(machine: string, command: string, timeoutMs?: number): Promise<{ out: string; ok: boolean }> {
+  const { stdout } = await exec(instanceId, machine, [
+    "sh", "-c", `exec 2>&1\n${command}\necho "__exit=$?"`,
+  ], timeoutMs);
+  const marker = stdout.lastIndexOf("__exit=");
+  if (marker < 0) return { out: stdout, ok: false };
+  return { out: stdout.slice(0, marker), ok: stdout.slice(marker + 7).trim() === "0" };
+}
+
+async function must(machine: string, command: string, timeoutMs?: number): Promise<string> {
+  const { out, ok } = await on(machine, command, timeoutMs);
+  if (!ok) throw new Error(`${machine}: ${command}\n${out}`);
+  return out;
+}
+
+/** The control plane, a container on the first node. */
+async function mesh(command: string, timeoutMs?: number): Promise<string> {
+  return must("anchor", `docker exec mesh-control /mesh-control ${command}`, timeoutMs);
+}
+
+/** The pinned reference for one of the scenario's images, by repository. */
+function pinned(repository: string): string {
+  const found = stocked.find((r) => r.slice(r.indexOf("/") + 1, r.indexOf("@")) === repository);
+  assert.ok(found, `the scenario stocks no ${repository}; it serves ${stocked.join(", ")}`);
+  return found;
+}
+
+/** The substrate bundle, its image references pointed at this scenario's own registry. */
+function bundleFor(images: string[]): string {
+  let text = readFileSync(bundle, "utf8");
+  for (const ref of images) {
+    const repository = ref.slice(ref.indexOf("/") + 1, ref.indexOf("@"));
+    const escaped = repository.replaceAll("/", "\\/").replaceAll(".", "\\.");
+    text = text.replaceAll(new RegExp(`[A-Za-z0-9_.:-]+\\/${escaped}@sha256:[0-9a-f]+`, "g"), ref);
+  }
+  return text;
+}
+
+function tokenFrom(said: string): string {
+  const found = said.split("\n").map((l) => l.trim()).find((l) => l.length > 100 && !l.includes(" "));
+  assert.ok(found, `no token in:\n${said}`);
+  return found;
+}
+
+async function settled(node: string, withinMs = 1_200_000): Promise<void> {
+  const until = Date.now() + withinMs;
+  let last = "";
+  while (Date.now() < until) {
+    let state: {
+      wrong: { node: string; outcome: string; refused?: string;
+               failed?: { id: string; error: string }[] }[];
+      waiting: { node: string; never: boolean }[];
+      reported: { node: string; outcome: string; current: boolean }[];
+    } | undefined;
+    let said = "";
+    try {
+      const asked = await on("anchor", `docker exec mesh-control /mesh-control status --json`);
+      said = asked.out;
+      if (asked.ok) state = JSON.parse(said);
+    } catch (err) {
+      said = (err as Error).message;
+    }
+    if (!state) {
+      last = said;
+      await new Promise((r) => setTimeout(r, 5000));
+      continue;
+    }
+    const bad = state.wrong.find((w) => w.node === node);
+    if (bad) {
+      const why = [bad.refused, ...(bad.failed ?? []).map((f) => `${f.id}: ${f.error}`)]
+        .filter(Boolean).join("\n  ");
+      throw new Error(`${node} did not apply what it was sent (${bad.outcome}):\n  ${why}`);
+    }
+    const word = state.reported.find((r) => r.node === node);
+    const acted = word?.outcome === "applied" && word.current;
+    if (!state.waiting.some((w) => w.node === node) && acted) return;
+    last = said;
+    await new Promise((r) => setTimeout(r, 5000));
+  }
+  const ps = (await on(NODE, `docker ps -a --format '{{.Names}}\t{{.Status}}'`)).out;
+  const hostLog = (await on(NODE, `tail -80 /var/log/mesh-host.log`)).out;
+  throw new Error(
+    `${node} never caught up within ${Math.round(withinMs / 1000)}s.\nLast status:\n${last}\n` +
+      `--- ${NODE} docker ps -a ---\n${ps}\n--- ${NODE} mesh-host.log tail ---\n${hostLog}`);
+}
+
+before(async () => {
+  if (skip) return;
+
+  const raised = await raise(loadScenario(`scenarios/${SCENARIO}.yml`), {
+    onProgress: (m) => console.log(`raise: ${m}`),
+  });
+  instanceId = raised.instanceId;
+  stocked = raised.images;
+
+  await must("anchor", `cat > /tmp/substrate.lock <<'MESHBUNDLE'\n${bundleFor(raised.images)}\nMESHBUNDLE`);
+  await must("anchor", `${HOST_PATH} apply /tmp/substrate.lock`, 600_000);
+  const up = await must("anchor", `docker ps --format '{{.Names}}'`);
+  for (const c of ["mesh-store", "mesh-broker", "mesh-control"]) {
+    assert.match(up, new RegExp(c), `the substrate did not raise ${c}:\n${up}`);
+  }
+
+  for (const [machine, node] of [["anchor", "anchor"], ["laptop", "laptop"]] as const) {
+    await mesh(`node add ${node}`);
+    const token = tokenFrom(await mesh(`token issue --node ${node}`));
+    const said = await must(machine, `${HOST_PATH} enrol --token ${quote(token)}`);
+    assert.match(said, new RegExp(`enrolled as ${node}`), said);
+    await must(machine, `nohup ${HOST_PATH} run > /var/log/mesh-host.log 2>&1 & sleep 3`);
+  }
+}, { timeout: 1_800_000 });
+
+after(async () => {
+  if (instanceId) await destroy(instanceId);
+  await destroyAll(`${SCENARIO}-`);
+}, { timeout: 600_000 });
+
+test("the lavinmq provider and its consumer ride laptop while the substrate broker owns 5672 on anchor", {
+  skip, timeout: 1_500_000,
+}, async () => {
+  // ================================================================================================
+  // THE MANIFESTS — the committed catalogue shapes, verbatim from mesh-catalog. Only the images (to
+  // what this scenario serves by digest) change.
+  // ================================================================================================
+
+  // --- lavinmq: a provider of the `amqp` interface. Its server publishes 5672 so consumers reach it
+  // at the node address the mesh writes into their grant; the management API (15672) stays inside the
+  // module's private network. A run-once bootstrap computes the admin password HASH lavinmq needs
+  // (the mesh delivers a plain secret; lavinmq's config wants a hash) and writes the config the broker
+  // reads, BEFORE the broker starts. The provisioner then reaches the management API as that admin.
+  const lavinmqManifest = JSON.stringify({
+    module: "lavinmq",
+    version: "1",
+    provides: [{ name: "amqp", scope: "mesh" }],
+    serves: { amqp: { port: 5672 } },
+    emits: ["module.lavinmq.amqp.provisioned", "module.lavinmq.amqp.deprovisioned"],
+    consumes: ["module.lavinmq.amqp.provisioned", "module.lavinmq.amqp.deprovisioned"],
+    receives: { amqp: "/var/lib/lavinmq-module/grants/mesh.json" },
+    grants: { amqp: "/var/lib/lavinmq-module/grants" },
+    "own-secrets": { default: "/var/lib/lavinmq-module/default.secret", broker: "/var/lib/mesh/lavinmq/broker" },
+    resources: [
+      { id: "mesh-state", type: "directory", path: "/var/lib/mesh/lavinmq", mode: "0700" },
+      { id: "state", type: "directory", path: "/var/lib/lavinmq-module", mode: "0700" },
+      { id: "grants-dir", type: "directory", path: "/var/lib/lavinmq-module/grants", mode: "0700" },
+      { id: "data", type: "directory", path: "/services/lavinmq/data", mode: "0700" },
+      { id: "net", type: "network", name: "lavinmq" },
+      {
+        id: "bootstrap", type: "container", name: "lavinmq-bootstrap",
+        image: pinned("mesh-runtime-lavinmq"), "run-once": true,
+        volumes: [
+          "/var/lib/lavinmq-module:/var/lib/lavinmq-module",
+          "/var/lib/lavinmq-module/default.secret:/run/secrets/default:ro",
+        ],
+        env: {
+          MESH_PROVISION_ADMIN_USER: "mesh-admin",
+          MESH_PROVISION_PASSWORD_FILE: "/run/secrets/default",
+          MESH_LAVINMQ_CONFIG_OUT: "/var/lib/lavinmq-module/lavinmq.ini",
+          MESH_LAVINMQ_DATA_DIR: "/var/lib/lavinmq",
+        },
+        args: ["run", "/app/modules/lavinmq/dist/bootstrap/index.js"],
+      },
+      {
+        id: "server", type: "container", name: "lavinmq", image: pinned("cloudamqp/lavinmq"),
+        network: "lavinmq", ports: ["5672"],
+        volumes: [
+          "/services/lavinmq/data:/var/lib/lavinmq",
+          "/var/lib/lavinmq-module/lavinmq.ini:/etc/lavinmq/lavinmq.ini:ro",
+        ],
+        args: ["--config", "/etc/lavinmq/lavinmq.ini"],
+      },
+      {
+        id: "runtime", type: "container", name: "mesh-lavinmq", image: pinned("mesh-runtime-lavinmq"),
+        network: "lavinmq",
+        volumes: [
+          "/var/lib/mesh/lavinmq/broker:/run/secrets/broker:ro",
+          "/var/lib/lavinmq-module/grants:/var/lib/lavinmq-module/grants:ro",
+          "/var/lib/lavinmq-module/default.secret:/run/secrets/default:ro",
+        ],
+        env: {
+          MESH_BROKER_FILE: "/run/secrets/broker",
+          MESH_RECEIVES: "/var/lib/lavinmq-module/grants/mesh.json",
+          MESH_PROVISION_LAVINMQ: "http://lavinmq:15672",
+          MESH_PROVISION_ADMIN_USER: "mesh-admin",
+          MESH_PROVISION_PASSWORD_FILE: "/run/secrets/default",
+        },
+      },
+    ],
+  });
+
+  // --- amqp-ping: a consumer that requires `amqp`. It contributes nothing (the vhost is the login),
+  // binds the grant, and reads its connection from an env-file the mesh fills — USER and VHOST both
+  // ${bound:amqp:as} (the db-name lesson), PORT ${bound:amqp:port}, PASSWORD ${secret:amqp}. Its
+  // container connects and round-trips a message, then stays up. It carries a `slug` so its identity
+  // mesh_laptop_ping fits the 20-char backend bound (ADR 0049).
+  const amqpPingManifest = JSON.stringify({
+    module: "amqp-ping",
+    slug: "ping",
+    version: "1",
+    requires: ["amqp"],
+    contributes: {},
+    binds: { amqp: "/var/lib/amqp-ping/amqp.json" },
+    secrets: { amqp: "/var/lib/amqp-ping/amqp.secret" },
+    "own-secrets": { broker: "/var/lib/mesh/amqp-ping/broker" },
+    resources: [
+      { id: "mesh-state", type: "directory", path: "/var/lib/mesh/amqp-ping", mode: "0700" },
+      { id: "state", type: "directory", path: "/var/lib/amqp-ping", mode: "0700" },
+      {
+        id: "amqp-env", type: "file", path: "/var/lib/amqp-ping/amqp.env", mode: "0600",
+        content:
+          "MESH_AMQP_HOST=${bound:amqp:at}\nMESH_AMQP_PORT=${bound:amqp:port}\n" +
+          "MESH_AMQP_USER=${bound:amqp:as}\nMESH_AMQP_VHOST=${bound:amqp:as}\n" +
+          "MESH_AMQP_PASSWORD=${secret:amqp}\n",
+      },
+      { id: "net", type: "network", name: "amqp-ping" },
+      {
+        id: "runtime", type: "container", name: "amqp-ping", image: pinned("mesh-runtime-amqp-ping"),
+        network: "amqp-ping",
+        "env-file": ["/var/lib/amqp-ping/amqp.env"],
+        args: ["run", "/app/modules/amqp-ping/dist/index.js"],
+        "restart-on": ["amqp-env"],
+      },
+    ],
+  });
+
+  // --- add, issue a scoped broker account, assign to laptop --------------------------------------
+  async function addIssueAssign(name: string, manifest: string): Promise<void> {
+    await must("anchor", `printf %s ${quote(manifest)} > /tmp/${name}.json && docker cp /tmp/${name}.json mesh-control:/${name}.json`);
+    await mesh(`module add /${name}.json`);
+    const issued = await mesh(`module issue ${name} --node ${NODE}`);
+    assert.match(issued, /broker account/, issued);
+    await mesh(`assign ${NODE} ${name}`);
+  }
+
+  // The consumer connects to the provider by the binding's `at` — the provider's private-network
+  // address the mesh fills. So the overlay is assigned first, to both nodes, even though provider and
+  // consumer are co-located (the same reason two-node-db does it).
+  await mesh("overlay place anchor --hub --endpoint 192.0.2.10:51820 --site lab");
+  await mesh(`overlay place ${NODE} --site lab`);
+  await mesh("assign anchor networking");
+  await mesh(`assign ${NODE} networking`);
+
+  await addIssueAssign("lavinmq", lavinmqManifest);
+  await addIssueAssign("amqp-ping", amqpPingManifest);
+
+  // ONE push, ONE convergence — provider and consumer resolved and applied together on laptop, past
+  // the run-once bootstrap that gates the broker.
+  await mesh(`push ${NODE}`);
+  await settled(NODE);
+
+  // ================================================================================================
+  // THE two-node split — the substrate broker owns 5672 on anchor, the provider owns it on laptop.
+  // ================================================================================================
+  const onAnchor = await must("anchor", `docker ps --format '{{.Names}}'`);
+  const onLaptop = await must(NODE, `docker ps --format '{{.Names}}'`);
+  assert.match(onAnchor, /(^|\n)mesh-broker(\n|$)/, "the substrate broker is not on the first node");
+  assert.doesNotMatch(onAnchor, /(^|\n)lavinmq(\n|$)/,
+    "the lavinmq provider landed on the substrate node — the 5672 collision this bed exists to avoid");
+  assert.doesNotMatch(onLaptop, /(^|\n)mesh-store(\n|$)/, "the substrate store leaked onto the second node");
+  assert.match(onLaptop, /(^|\n)lavinmq(\n|$)/, "the lavinmq provider is not on the second node");
+
+  // ================================================================================================
+  // THE run-once bootstrap ran to completion and is gone (a step, not a service). The broker being up
+  // at all is the proof it ran at the right phase — an un-bootstrapped broker has no config to read.
+  // ================================================================================================
+  const allOnLaptop = await must(NODE, `docker ps -a --format '{{.Names}}'`);
+  assert.doesNotMatch(allOnLaptop, /(^|\n)lavinmq-bootstrap(\n|$)/,
+    `the run-once bootstrap was left as a container instead of run to completion:\n${allOnLaptop}`);
+  const iniExists = await on(NODE, `test -f /var/lib/lavinmq-module/lavinmq.ini`);
+  assert.ok(iniExists.ok, "the bootstrap did not write the broker config");
+
+  // ================================================================================================
+  // THE service and both runtimes are up on laptop.
+  // ================================================================================================
+  for (const name of ["lavinmq", "mesh-lavinmq", "amqp-ping"]) {
+    assert.match(onLaptop, new RegExp(`(^|\\n)${name}(\\n|$)`),
+      `${name} is not running on the second node after the push:\n${onLaptop}\n---host log---\n${(await on(NODE, `tail -60 /var/log/mesh-host.log`)).out}`);
+  }
+
+  // Everything up and STABLE — no crash-loop. Sample restart counts, wait, require they did not rise.
+  const stable = ["lavinmq", "mesh-lavinmq", "amqp-ping"];
+  const restarts = new Map<string, number>();
+  for (const name of stable) {
+    const [running, count] = (await must(NODE, `docker inspect -f '{{.State.Running}} {{.RestartCount}}' ${name}`)).trim().split(" ");
+    assert.equal(running, "true",
+      `${name} is not running after the push:\n${(await on(NODE, `docker logs ${name} 2>&1 | tail -40`)).out}`);
+    restarts.set(name, Number(count));
+  }
+  await new Promise((r) => setTimeout(r, 20000));
+  for (const name of stable) {
+    const [running, count] = (await must(NODE, `docker inspect -f '{{.State.Running}} {{.RestartCount}}' ${name}`)).trim().split(" ");
+    assert.equal(running, "true",
+      `${name} fell over after the push:\n${(await on(NODE, `docker logs ${name} 2>&1 | tail -40`)).out}`);
+    assert.ok(Number(count) <= (restarts.get(name) ?? 0),
+      `${name} is crash-looping (restart count rose ${restarts.get(name)} -> ${count}):\n` +
+        `${(await on(NODE, `docker logs ${name} 2>&1 | tail -40`)).out}`);
+  }
+
+  // ================================================================================================
+  // Each module got its own scoped broker account on the substrate broker (anchor), named for the
+  // node that runs it and the module.
+  // ================================================================================================
+  const users = await must("anchor", `docker exec mesh-broker lavinmqctl list_users 2>&1`);
+  for (const acct of ["laptop-lavinmq", "laptop-amqp-ping"]) {
+    assert.match(users, new RegExp(acct), `the scoped account ${acct} is not on the broker:\n${users}`);
+  }
+
+  // ================================================================================================
+  // THE provider path — the provisioner (in mesh-lavinmq on laptop) created the consumer's vhost AND
+  // user, both named for the login the mesh derived. Checked with lavinmqctl inside the broker (its
+  // local control socket needs no auth); the admin authenticating to the management API is implicit,
+  // because the vhost could not exist otherwise.
+  // ================================================================================================
+  let vhosts = { out: "", ok: false };
+  const untilVhost = Date.now() + 90_000;
+  while (Date.now() < untilVhost) {
+    vhosts = await on(NODE, `docker exec lavinmq lavinmqctl list_vhosts 2>&1`);
+    if (vhosts.ok && new RegExp(CONSUMER_LOGIN).test(vhosts.out)) break;
+    await new Promise((r) => setTimeout(r, 3000));
+  }
+  assert.match(vhosts.out, new RegExp(CONSUMER_LOGIN),
+    `the provisioner never created the consumer's vhost ${CONSUMER_LOGIN}:\n` +
+      `${(await on(NODE, `docker logs mesh-lavinmq 2>&1 | tail -40`)).out}\n---\n${vhosts.out}`);
+  const provUsers = await must(NODE, `docker exec lavinmq lavinmqctl list_users 2>&1`);
+  assert.match(provUsers, new RegExp(CONSUMER_LOGIN),
+    `the provisioner created the vhost but not the user ${CONSUMER_LOGIN}:\n${provUsers}`);
+
+  // ================================================================================================
+  // THE consumer was bound its scoped login, and its container round-tripped a message. The binding
+  // proves the mesh derived and delivered the login; the log line proves the container connected to
+  // its vhost with the mesh-minted password and published+consumed a message back.
+  // ================================================================================================
+  const bound = await waitForBinding("/var/lib/amqp-ping/amqp.json");
+  assert.equal(bound.provision, "amqp", `amqp-ping was bound the wrong provision: ${bound.provision}`);
+  assert.equal(bound.as, CONSUMER_LOGIN,
+    `amqp-ping's login is ${bound.as}, not the derived ${CONSUMER_LOGIN}`);
+
+  let log = "";
+  const untilPing = Date.now() + 150_000;
+  while (Date.now() < untilPing) {
+    log = (await on(NODE, `docker logs amqp-ping 2>&1 | tail -40`)).out;
+    if (/round-trip ok/.test(log)) break;
+    await new Promise((r) => setTimeout(r, 3000));
+  }
+  assert.match(log, /round-trip ok/,
+    `the consumer never round-tripped a message over its granted broker:\n${log}`);
+  assert.match(log, new RegExp(`vhost ${CONSUMER_LOGIN}`),
+    `the consumer connected to a vhost other than its own login:\n${log}`);
+
+  // Helper: wait for the mesh to write the consumer's binding with an `as`, and parse it.
+  async function waitForBinding(path: string): Promise<{ as: string; provision: string }> {
+    let raw = "";
+    const until = Date.now() + 90_000;
+    while (Date.now() < until) {
+      const got = await on(NODE, `cat ${path} 2>/dev/null`);
+      if (got.ok && /"as"/.test(got.out)) { raw = got.out; break; }
+      await new Promise((r) => setTimeout(r, 3000));
+    }
+    assert.match(raw, /"as"/, `the mesh never wrote a binding with a login to ${path}:\n${raw}`);
+    return JSON.parse(raw) as { as: string; provision: string };
+  }
+});