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/icecast/module.json.captured

@@ -0,0 +1,152 @@
+{
+  "module": "icecast",
+  "version": "1",
+  "requires": [
+    "route",
+    "secret"
+  ],
+  "contributes": {
+    "route": {
+      "label": "icecast",
+      "endpoint": "stream"
+    }
+  },
+  "binds": {
+    "route": "${dir:state}/route.json"
+  },
+  "secrets": {
+    "secret": {
+      "source": "${dir:state}/source.secret",
+      "admin": "${dir:state}/admin.secret",
+      "relay": "${dir:state}/relay.secret"
+    }
+  },
+  "capabilities": [
+    "container-runtime"
+  ],
+  "emits": [
+    "stream.started",
+    "stream.stopped"
+  ],
+  "listens": [
+    {
+      "name": "stream",
+      "port": 8000,
+      "protocol": "tcp",
+      "from": "mesh",
+      "why": "streams in from sources (HTTP PUT) and out to listeners, plus the status and admin pages; a public name is its route"
+    }
+  ],
+  "data": {
+    "own": [
+      {
+        "id": "logs",
+        "path": "${dir:logs}",
+        "class": "cache",
+        "why": "the streaming server's logs"
+      }
+    ]
+  },
+  "config": {
+    "url": {
+      "type": "string",
+      "description": "The address the module's tools reach Icecast at, as a URL; unset, the code falls back to its environment, else this machine's Icecast on its port.",
+      "trusted": true,
+      "default": ""
+    },
+    "user": {
+      "type": "string",
+      "description": "The Icecast admin account the module's tools sign in as; unset, the code falls back to its environment, else admin.",
+      "trusted": true,
+      "default": ""
+    }
+  },
+  "resources": [
+    {
+      "id": "mesh-state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "mesh",
+      "unknown": "program"
+    },
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": ".",
+      "unknown": "program"
+    },
+    {
+      "id": "logs",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "100:101",
+      "unknown": "program"
+    },
+    {
+      "id": "server-conf",
+      "type": "file",
+      "path": "${dir:state}/icecast.xml",
+      "mode": "0600",
+      "template": "files/icecast.xml"
+    },
+    {
+      "id": "net",
+      "type": "network",
+      "name": "icecast"
+    },
+    {
+      "id": "server",
+      "type": "container",
+      "name": "icecast",
+      "image": "infiniteproject/icecast@sha256:cd506cf3dfe31ce05fd37d7e672dbd1213e7255cc93d28ecf5a3b547af4e162c",
+      "network": "icecast",
+      "ports": [
+        "8000"
+      ],
+      "volumes": [
+        "${dir:state}/icecast.xml:/etc/icecast.xml:ro",
+        "${dir:logs}:/var/log/icecast"
+      ],
+      "restart-on": [
+        "server-conf"
+      ]
+    },
+    {
+      "id": "runtime-config",
+      "type": "file",
+      "path": "${dir:mesh-state}/config.json",
+      "mode": "0600",
+      "template": "files/config.json",
+      "merge": "json",
+      "takes-config": ["url", "user"]
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "code",
+        "kind": "bundle",
+        "language": "typescript",
+        "entrypoints": [
+          "index.js",
+          "tools/index.js"
+        ],
+        "loads": [
+          "index.js",
+          "tools/index.js"
+        ],
+        "env": {
+          "MESH_ICECAST_URL": "http://127.0.0.1:${port:8000}",
+          "MESH_ICECAST_CONFIG_FILE": "${dir:mesh-state}/config.json",
+          "MESH_ICECAST_ADMIN_PASSWORD_FILE": "${dir:state}/admin.secret"
+        }
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
+      }
+    ]
+  }
+}