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/n8n/module.json.captured

@@ -0,0 +1,173 @@
+{
+  "module": "n8n",
+  "version": "1",
+  "capabilities": [
+    "container-runtime"
+  ],
+  "requires": [
+    "postgres-database",
+    "route"
+  ],
+  "contributes": {
+    "postgres-database": {
+      "name": "n8n"
+    },
+    "route": {
+      "label": "n8n",
+      "endpoint": "web"
+    }
+  },
+  "binds": {
+    "postgres-database": "${dir:state}/database.json",
+    "route": "${dir:state}/route.json"
+  },
+  "secrets": {
+    "postgres-database": "${dir:state}/database.secret"
+  },
+  "accesses": [
+    {
+      "id": "media",
+      "mode": "read-write"
+    }
+  ],
+  "listens": [
+    {
+      "name": "web",
+      "port": 5678,
+      "protocol": "tcp",
+      "from": "mesh",
+      "why": "the n8n editor, its REST API and the webhook endpoints workflows are triggered through; a public name is the route's"
+    }
+  ],
+  "data": {
+    "own": [
+      {
+        "id": "data",
+        "path": "${dir:data}",
+        "class": "valuable",
+        "why": "the instance's encryption key, settings and binary data; workflows are in the database"
+      },
+      {
+        "id": "cache",
+        "path": "${dir:cache}",
+        "class": "cache",
+        "why": "scratch space"
+      }
+    ]
+  },
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": ".",
+      "unknown": "program"
+    },
+    {
+      "id": "data",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "1000:1000",
+      "unknown": "program"
+    },
+    {
+      "id": "cache",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "999:999",
+      "unknown": "program"
+    },
+    {
+      "id": "database-secret",
+      "type": "file",
+      "path": "${dir:state}/n8n-database.secret",
+      "mode": "0400",
+      "owner": "1000:1000",
+      "template": "files/n8n-database.secret"
+    },
+    {
+      "id": "server-env",
+      "type": "file",
+      "path": "${dir:state}/server.env",
+      "mode": "0600",
+      "template": "files/server.env"
+    },
+    {
+      "id": "net",
+      "type": "network",
+      "name": "n8n"
+    },
+    {
+      "id": "server",
+      "type": "container",
+      "health": {
+        "kind": "http",
+        "endpoint": "web",
+        "path": "/healthz/readiness",
+        "status": 200,
+        "needs": "postgres-database"
+      },
+      "name": "n8n",
+      "artifact": "server",
+      "network": "n8n",
+      "env-file": [
+        "${dir:state}/server.env"
+      ],
+      "ports": [
+        "5678"
+      ],
+      "volumes": [
+        "${dir:data}:/home/node/.n8n",
+        "${dir:state}/n8n-database.secret:/run/secrets/database:ro",
+        "${access:media}:/media-library"
+      ]
+    },
+    {
+      "id": "cache-server",
+      "type": "container",
+      "name": "n8n-redis",
+      "image": "redis@sha256:8a1efc5f479551822b47424ccae982026b633f28818eab0387348120a61e10e2",
+      "network": "n8n",
+      "args": [
+        "redis-server",
+        "--appendonly",
+        "yes"
+      ],
+      "volumes": [
+        "${dir:cache}:/data"
+      ]
+    },
+    {
+      "id": "browser",
+      "type": "container",
+      "name": "n8n-selenium",
+      "image": "selenium/standalone-chrome@sha256:9ae1c78e9b2ca9fe4b22e57873b5ee34aeb8e814e3122293eef4c3abe4c5f448",
+      "network": "n8n",
+      "env": {
+        "SE_ENABLE_TRACING": "false",
+        "SE_NODE_MAX_SESSIONS": "5",
+        "SE_NODE_OVERRIDE_MAX_SESSIONS": "true"
+      }
+    }
+  ],
+  "build": {
+    "on": [
+      {
+        "arg": "N8N_BASE",
+        "image": "n8nio/n8n@sha256:4846eb2f4b874ab04cde7fc1e249d2ddaec66e9aea64439beb2972cfea88e3c0"
+      }
+    ],
+    "artifacts": [
+      {
+        "name": "server",
+        "kind": "image",
+        "from": "Dockerfile"
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
+      }
+    ]
+  }
+}