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/nftables/module.json.captured

@@ -0,0 +1,91 @@
+{
+  "module": "nftables",
+  "version": "1",
+  "upgrade": {
+    "policy": "record",
+    "why": "the machine's packet filter: a build that breaks it can cut the machine off from the bus, and then neither the gate's rollback nor a push reaches it (hq ADR 0236)"
+  },
+  "capabilities": [
+    "firewall"
+  ],
+  "claims": [
+    {
+      "name": "node-packet-filter",
+      "scope": "node",
+      "serves": [
+        "rules",
+        "reload",
+        "remove"
+      ]
+    }
+  ],
+  "filtering": {
+    "into": "/etc/nftables.conf"
+  },
+  "resources": [
+    {
+      "id": "package",
+      "type": "package",
+      "package": "nftables"
+    },
+    {
+      "id": "legacy-tools",
+      "type": "package",
+      "package": "iptables"
+    },
+    {
+      "id": "unit",
+      "type": "file",
+      "path": "/etc/systemd/system/mesh-filter.service",
+      "template": "files/mesh-filter.service",
+      "mode": "0644"
+    },
+    {
+      "id": "stock-unit-stop",
+      "type": "file",
+      "path": "/etc/systemd/system/nftables.service.d/mesh.conf",
+      "template": "files/mesh.conf",
+      "mode": "0644"
+    },
+    {
+      "id": "load",
+      "type": "service",
+      "unit": "mesh-filter.service",
+      "state": "running",
+      "boot": "enabled",
+      "restart-on": [
+        "unit",
+        "stock-unit-stop"
+      ],
+      "reload-on": [
+        "filtering"
+      ]
+    },
+    {
+      "id": "front-end",
+      "type": "package",
+      "package": "ufw",
+      "absent": true
+    }
+  ],
+  "tools": [
+    "firewall_rules"
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "typescript",
+        "entrypoints": [
+          "tools/index.js"
+        ]
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
+      }
+    ]
+  }
+}