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/pacman/module.json.captured

@@ -0,0 +1,136 @@
+{
+  "module": "pacman",
+  "version": "1",
+  "capabilities": [
+    "package-manager",
+    "service-manager"
+  ],
+  "claims": [
+    {
+      "name": "node-package-manager",
+      "scope": "node"
+    }
+  ],
+  "tools": [
+    "pacman_search",
+    "pacman_info",
+    "pacman_installed",
+    "pacman_owns",
+    "pacman_files",
+    "pacman_updates",
+    "pacman_upgrade",
+    "pacman_upgrade_health",
+    "pacman_orphans",
+    "pacman_remove_orphans",
+    "pacman_cache",
+    "pacman_history",
+    "pacman_mirrors",
+    "pacman_foreign",
+    "pacman_news",
+    "pacman_config"
+  ],
+  "resources": [
+    {
+      "id": "package",
+      "type": "package",
+      "package": "pacman"
+    },
+    {
+      "id": "config",
+      "type": "file",
+      "path": "/etc/pacman.conf",
+      "mode": "0644",
+      "template": "files/pacman.conf"
+    },
+    {
+      "id": "contrib",
+      "type": "package",
+      "package": "pacman-contrib"
+    },
+    {
+      "id": "reflector",
+      "type": "package",
+      "package": "reflector"
+    },
+    {
+      "id": "mirrors",
+      "type": "file",
+      "path": "/etc/xdg/reflector/reflector.conf",
+      "mode": "0644",
+      "template": "files/reflector.conf"
+    },
+    {
+      "id": "mirror-refresh",
+      "type": "service",
+      "unit": "reflector.timer",
+      "state": "running",
+      "boot": "enabled",
+      "health": {
+        "kind": "unit"
+      }
+    },
+    {
+      "id": "cache-cleaning",
+      "type": "service",
+      "unit": "paccache.timer",
+      "state": "running",
+      "boot": "enabled",
+      "health": {
+        "kind": "unit"
+      }
+    },
+    {
+      "id": "upgrade-service",
+      "type": "file",
+      "path": "/etc/systemd/system/mesh-pacman-weekly-upgrade.service",
+      "mode": "0644",
+      "template": "files/mesh-pacman-weekly-upgrade.service"
+    },
+    {
+      "id": "upgrade-timer",
+      "type": "file",
+      "path": "/etc/systemd/system/mesh-pacman-weekly-upgrade.timer",
+      "mode": "0644",
+      "template": "files/mesh-pacman-weekly-upgrade.timer"
+    },
+    {
+      "id": "weekly-upgrade",
+      "type": "service",
+      "unit": "mesh-pacman-weekly-upgrade.timer",
+      "state": "running",
+      "boot": "enabled",
+      "restart-on": [
+        "upgrade-service",
+        "upgrade-timer"
+      ],
+      "health": {
+        "kind": "tool",
+        "tool": "pacman_upgrade_health",
+        "interval": "60s",
+        "timeout": "20s",
+        "looks": 2,
+        "grace": "60s"
+      }
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/pacman-tools",
+        "binary": "pacman-tools",
+        "loads": [
+          "pacman-tools"
+        ]
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
+      }
+    ]
+  }
+}