The node-engine owns the composition it alone runs (H1, H2)

ADR 0593 §1 and §7: compose, its bus reader and runtime reader, takein,
validate, the overlay generator, the composer's run and mesh-compose, and
the judgement of a move leave mesh-sdk for the node-engine's internal
packages, so no other module composes and a change to them rebuilds only
the node-engine. The shapes others read (the composer's request and
verdict, the overlay's names, compositions and answers) stay in mesh-sdk.
The node's grant is now a golden file of what the grants part composes,
since the composer of the bus's user list leaves mesh-sdk too.

Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL

cmd/mesh-compose/testdata/mesh-catalog/modules/mosquitto/module.json.captured

@@ -0,0 +1,194 @@
+{
+  "module": "mosquitto",
+  "version": "1",
+  "slug": "mosq",
+  "provides": [
+    {
+      "name": "mqtt-topic",
+      "scope": "mesh",
+      "identity": {
+        "in": "a Mosquitto client and topic prefix"
+      }
+    }
+  ],
+  "capabilities": [
+    "container-runtime"
+  ],
+  "emits": [
+    "topic.provisioned",
+    "topic.deprovisioned"
+  ],
+  "consumes": [
+    "mosquitto.topic.provisioned",
+    "mosquitto.topic.deprovisioned"
+  ],
+  "serves": {
+    "mqtt-topic": {
+      "scheme": "mqtt",
+      "port": 1883
+    }
+  },
+  "receives": {
+    "mqtt-topic": "${dir:grants}/mesh.json"
+  },
+  "grants": {
+    "mqtt-topic": "${dir:grants}"
+  },
+  "own-secrets": {
+    "admin": {
+      "path": "${dir:mesh-state}/admin",
+      "taken": "at-start"
+    }
+  },
+  "listens": [
+    {
+      "name": "mqtt",
+      "port": 1883,
+      "protocol": "tcp",
+      "from": "mesh",
+      "why": "modules on any machine that were granted a topic namespace"
+    },
+    {
+      "name": "mqtt-websockets",
+      "port": 8081,
+      "protocol": "tcp",
+      "from": "mesh",
+      "why": "the same broker over MQTT-on-WebSockets, for browser clients"
+    }
+  ],
+  "data": {
+    "own": [
+      {
+        "id": "data",
+        "path": "${dir:data}",
+        "class": "rebuildable",
+        "why": "retained messages and sessions; devices publish them again"
+      }
+    ],
+    "consumers": {
+      "mqtt-topic": {
+        "class": "rebuildable",
+        "in": "data",
+        "why": "retained messages are published again by the devices"
+      }
+    }
+  },
+  "resources": [
+    {
+      "id": "mesh-state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "mesh",
+      "unknown": "program"
+    },
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": ".",
+      "unknown": "program"
+    },
+    {
+      "id": "grants",
+      "type": "directory",
+      "mode": "0700",
+      "unknown": "program"
+    },
+    {
+      "id": "data",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "1883:1883",
+      "unknown": "program"
+    },
+    {
+      "id": "server-conf",
+      "type": "file",
+      "path": "${dir:state}/mosquitto.conf",
+      "mode": "0600",
+      "owner": "1883:1883",
+      "template": "files/mosquitto.conf"
+    },
+    {
+      "id": "net",
+      "type": "network",
+      "name": "mosquitto"
+    },
+    {
+      "id": "bootstrap-env",
+      "type": "file",
+      "path": "${dir:state}/bootstrap.env",
+      "mode": "0600",
+      "template": "files/bootstrap.env"
+    },
+    {
+      "id": "bootstrap",
+      "type": "process",
+      "name": "mosquitto-bootstrap",
+      "artifact": "code",
+      "run": [
+        "node",
+        "bootstrap/index.js"
+      ],
+      "run-once": true,
+      "env-file": [
+        "${dir:state}/bootstrap.env"
+      ],
+      "restart-on": [
+        "bootstrap-env",
+        "needs-admin"
+      ]
+    },
+    {
+      "id": "server",
+      "type": "container",
+      "name": "mosquitto",
+      "image": "eclipse-mosquitto@sha256:38c0da4f2ef84284d47b3b3eeea1cb3bdeabe81ee10caf0cd5c5ff61ee3ea408",
+      "health": {
+        "kind": "tcp",
+        "endpoint": "mqtt"
+      },
+      "network": "mosquitto",
+      "ports": [
+        "1883",
+        "8081"
+      ],
+      "volumes": [
+        "${dir:data}:/mosquitto/data",
+        "${dir:state}/mosquitto.conf:/mosquitto/config/mosquitto.conf:ro"
+      ]
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "code",
+        "kind": "bundle",
+        "language": "typescript",
+        "entrypoints": [
+          "index.js",
+          "tools/index.js",
+          "provisioner/index.js",
+          "bootstrap/index.js"
+        ],
+        "loads": [
+          "index.js",
+          "tools/index.js",
+          "provisioner/index.js"
+        ],
+        "env": {
+          "MESH_RECEIVES": "${dir:grants}/mesh.json",
+          "MESH_PROVISION_MQTT": "127.0.0.1:${port:1883}",
+          "MESH_PROVISION_ADMIN_USER": "mesh-admin",
+          "MESH_PROVISION_PASSWORD_FILE": "${dir:mesh-state}/admin",
+          "MESH_MQTT_CTRL_CONTAINER": "mosquitto"
+        }
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
+      }
+    ]
+  }
+}