The control plane prepares its own state, like any module

Now that every parser on the mesh knows the word, the control plane's manifest says it. Its schema
stops being a special case: the mesh derives the step from its own resource and gates its server on
it, which is the failure of novox/hq 04-ISSUES/133 closed by the mechanism rather than by a
hand-written step in one manifest.

module.json

@@ -27,6 +27,7 @@
     "bus": "/var/lib/mesh/mesh-controller/bus"
   },
   "secrets-owner": "65534:65534",
+  "prepares": true,
   "resources": [
     {
       "id": "mesh-state",