Assigner: hold the seat mesh-wants, keep a person's upgrade policy and judge moves by it, say a policy split with the controller as a finding, and answer the bus step, so the policies and the bus step leave the controller (issue 1953 D4-D6)

modules/mesh-delivery-assigner/module.json

@@ -15,6 +15,14 @@
         "adopt",
         "hand-back"
       ]
+    },
+    {
+      "name": "mesh-wants",
+      "scope": "mesh",
+      "serves": [
+        "upgrade",
+        "bus"
+      ]
     }
   ],
   "reads": [
@@ -48,6 +56,7 @@
     "seat:mesh-controller.unpin",
     "seat:mesh-controller.warranted",
     "seat:mesh-hand-acts.hand-act",
+    "seat:mesh-hand-acts.hand-acts",
     "seat:mesh-hand-acts.warranted",
     "seat:node-backup.backed-up",
     "seat:node-backup.now"
@@ -70,7 +79,8 @@
     { "name": "differences", "history": 64 },
     { "name": "puts", "history": 20 },
     { "name": "wants", "history": 20 },
-    { "name": "findings", "history": 5 }
+    { "name": "findings", "history": 5 },
+    { "name": "policies", "history": 20 }
   ],
   "streams": [
     {