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/nodejs/module.json.captured

@@ -0,0 +1,25 @@
+{
+  "module": "nodejs",
+  "version": "1",
+  "capabilities": [
+    "package-manager"
+  ],
+  "provides": [
+    {
+      "name": "node-toolchain",
+      "reach": "machine"
+    }
+  ],
+  "resources": [
+    {
+      "id": "nodejs",
+      "type": "package",
+      "package": "nodejs"
+    },
+    {
+      "id": "npm",
+      "type": "package",
+      "package": "npm"
+    }
+  ]
+}