C3d REG2: distribution keeps no caller list; the build modules are the catalog half's claimants of node-build-* seats

The config `callers`, the tool registry_callers and its invokes, the caller-list code and the holder's per-verb
Allowed checks go. The windows' driver counts as build modules the modules claiming a `node-build-*` seat in the
catalog half, followed by the seat mesh-catalog's branch follower on the program's views reader (one shared events
hub); it wakes again when a build module's entry moves. The retention check of remove finds the artifact sweep's
holder through the seat mesh-module-assigner's holders (seatlist.HolderOf), not a name.

Builds: design 47 G §610, §7, §428, A-156, A-82
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/distribution/module.json

@@ -50,7 +50,6 @@
     }
   ],
   "tools": [
-    "registry_callers",
     "registry_direct_writes",
     "registry_health",
     "registry_holds",
@@ -59,26 +58,24 @@
     "registry_old_name"
   ],
   "invokes": [
-    "distribution.registry_callers",
     "seat:mesh-builds.reserved",
     "mesh-delivery-view.node_haves",
     "seat:node-engine.manifest-reads",
-    "seat:mesh-hand-acts.hand-act"
+    "seat:mesh-hand-acts.hand-act",
+    "seat:mesh-catalog.entry",
+    "seat:mesh-catalog.registrations",
+    "seat:mesh-catalog.revision",
+    "seat:mesh-delivery.source",
+    "seat:mesh-module-assigner.assignments"
   ],
   "consumes": [
     "mesh-delivery-view.delivered",
     "node-engine.manifest-reads-changed",
-    "mesh-conditions.findings-asked"
+    "mesh-conditions.findings-asked",
+    "mesh-catalog.catalog-revision",
+    "mesh-catalog.registration-changed",
+    "mesh-delivery.source-moved"
   ],
-  "config": {
-    "callers": {
-      "type": "string",
-      "trusted": true,
-      "runtime": true,
-      "default": "",
-      "description": "per verb, the modules that may call it (JSON object of verb to modules; operator for the operator's session); empty is design 51's list"
-    }
-  },
   "capabilities": [
     "container-runtime"
   ],