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/supabase/files/settings.json

@@ -0,0 +1,7 @@
+{
+  "pooler": {
+    "tenant": "default",
+    "pool-size": 20,
+    "max-client-connections": 100
+  }
+}