Assigner: drop the pull request's placement check and hold the seat's states as its own, since a placement change is no repository change (ADR 0567 §1, §4, §11, issue 1126)

modules/mesh-delivery-assigner/module.json

@@ -12,8 +12,6 @@
     "mesh-delivery-indexer.candidates",
     "mesh-delivery-indexer.manifests",
     "mesh-delivery-indexer.modules",
-    "mesh-delivery-indexer.placement",
-    "mesh-delivery-indexer.placement-candidates",
     "mesh-delivery-teller.answers",
     "mesh-delivery-watchman.presence",
     "node-engine.have"
@@ -36,6 +34,9 @@
     "assigner_puts"
   ],
   "state": [
+    { "name": "placement", "history": 64 },
+    { "name": "proposals", "history": 5 },
+    { "name": "candidates", "history": 5 },
     { "name": "asks", "history": 5 },
     { "name": "compositions", "history": 5 },
     { "name": "differences", "history": 64 },