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/time-sync/module.json.captured

@@ -16,7 +16,7 @@
       "type": "file",
       "path": "/etc/systemd/timesyncd.conf.d/50-mesh.conf",
       "mode": "0644",
-      "content": "# The mesh's (module time-sync, novox/hq to-be 42): the servers timesyncd asks. Written whole at\n# every push. A drop-in whose name sorts after this one wins over it: a hosting provider's own\n# servers are kept that way where the machine was found with them.\n[Time]\nNTP=0.europe.pool.ntp.org 1.europe.pool.ntp.org 2.europe.pool.ntp.org 3.europe.pool.ntp.org\nFallbackNTP=0.arch.pool.ntp.org 1.arch.pool.ntp.org 2.arch.pool.ntp.org 3.arch.pool.ntp.org\n",
+      "template": "files/50-mesh.conf",
       "names-on-purpose": {
         "0.europe.pool.ntp.org": "the public NTP pool's European zone: the world's time service, the same for every installation; nearest to every machine of this mesh",
         "1.europe.pool.ntp.org": "the public NTP pool's European zone: the world's time service, the same for every installation; nearest to every machine of this mesh",
@@ -70,6 +70,11 @@
         "loads": [
           "time-sync-tools"
         ]
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
       }
     ]
   }