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/cups/module.json.captured

@@ -0,0 +1,58 @@
+{
+  "module": "cups",
+  "version": "1",
+  "capabilities": [
+    "package-manager",
+    "service-manager"
+  ],
+  "tools": [
+    "cups_printers",
+    "cups_queue",
+    "cups_cancel",
+    "cups_print",
+    "cups_default",
+    "cups_resume",
+    "cups_drivers"
+  ],
+  "resources": [
+    {
+      "id": "package",
+      "type": "package",
+      "package": "cups"
+    },
+    {
+      "id": "driverless",
+      "type": "package",
+      "package": "cups-filters"
+    },
+    {
+      "id": "socket",
+      "type": "service",
+      "unit": "cups.socket",
+      "state": "running",
+      "boot": "enabled"
+    },
+    {
+      "id": "scheduler",
+      "type": "service",
+      "unit": "cups.service",
+      "state": "running",
+      "boot": "enabled"
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/cups-tools",
+        "binary": "cups-tools",
+        "loads": [
+          "cups-tools"
+        ]
+      }
+    ]
+  }
+}