artifact-store-tools: read the store through the registry seats' list, never its files or its read side (ADR 0632 §1, §4; issue 1966)

The docker exec listing and the HTTP door go; held and the sweep's index
skip ask the seat's list too. The store's address file is the image seat's
reach, used for the catalogue's definitions only.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

modules/artifact-store-tools/module.json

@@ -25,7 +25,9 @@
     "seat:oci-artifact-registry.remove",
     "seat:container-image-registry.hold",
     "seat:container-image-registry.release",
-    "seat:container-image-registry.remove"
+    "seat:container-image-registry.remove",
+    "seat:container-image-registry.list",
+    "seat:oci-artifact-registry.list"
   ],
   "reads": [
     "mesh-delivery-builder.builds",
@@ -93,7 +95,6 @@
           "artifact-store-tools"
         ],
         "env": {
-          "MESH_ARTIFACT_STORE_CONTAINER": "mesh-registry",
           "MESH_ARTIFACT_STORE_NAMES_FILE": "${dir:state}/store-names",
           "MESH_ARTIFACT_STORE_ADDRESS_FILE": "${dir:state}/store-address"
         }