Capture mesh-catalog at feat/r4g (2246ccc4) with the templates its manifests name and its predefined.json, and lay the copy out as a repository's root

The catalogue's manifests moved their content into template files and fall back to predefined keys, so a copy of
module.json alone no longer passes the catalogue's own check; the bus's Dockerfile is gone from the catalogue.

testdata/beside/mesh-catalog/modules/hello-web/module.json.captured

@@ -31,14 +31,15 @@
       "id": "state",
       "type": "directory",
       "mode": "0700",
-      "place": "."
+      "place": ".",
+      "unknown": "program"
     },
     {
       "id": "page",
       "type": "file",
       "path": "${dir:state}/index.html",
       "mode": "0644",
-      "content": "hello from hello-web, routed by the mesh\n"
+      "template": "files/index.html"
     },
     {
       "id": "net",
@@ -70,6 +71,11 @@
         "name": "server",
         "kind": "upstream",
         "from": "alpine@sha256:28bd5fe8b56d1bd048e5babf5b10710ebe0bae67db86916198a6eec434943f8b"
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
       }
     ]
   }