mesh-config: read declarations from each placed module's own manifests as built, and placement alone, so a module from its own repository resolves (issue 1953)

The controller's declared-config mirror never held de-spiegel's keys, and Resolve skipped
an assigned module it held no declarations of, silently: de-spiegel stayed held on novox
with its values set. Declarations now come from the indexer's trunk manifest with the
wanted build's laid over it per node; which module runs where from the seat
mesh-placement alone. A placed module with no readable manifest is listed as unresolved
with why, logged, and keeps its last resolved values.

modules/mesh-config/module.json

@@ -28,9 +28,11 @@
     "gitea.gitea_get_pull_request"
   ],
   "reads": [
-    "mesh-controller.assignments",
     "mesh-delivery-assigner.placement",
-    "mesh-controller.declared-config",
+    "mesh-delivery-assigner.wants",
+    "mesh-delivery-builder.builds",
+    "mesh-delivery-indexer.modules",
+    "mesh-delivery-indexer.manifests",
     "mesh-controller.predefined"
   ],
   "state": [