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/mssql/module.json.captured

@@ -80,32 +80,36 @@
       "id": "state",
       "type": "directory",
       "mode": "0700",
-      "place": "."
+      "place": ".",
+      "unknown": "program"
     },
     {
       "id": "grants",
       "type": "directory",
-      "mode": "0700"
+      "mode": "0700",
+      "unknown": "program"
     },
     {
       "id": "sa-env",
       "type": "file",
       "path": "${dir:state}/sa.env",
       "mode": "0600",
-      "content": "ACCEPT_EULA=Y\nMSSQL_SA_PASSWORD=${secret:sa}\n"
+      "template": "files/sa.env"
     },
     {
       "id": "data",
       "type": "directory",
       "mode": "0700",
-      "owner": "10001:0"
+      "owner": "10001:0",
+      "unknown": "program"
     },
     {
       "id": "dumps",
       "type": "directory",
       "path": "${dir:data}/backup",
       "mode": "0700",
-      "owner": "10001:0"
+      "owner": "10001:0",
+      "unknown": "program"
     },
     {
       "id": "net",
@@ -134,7 +138,7 @@
       "type": "file",
       "path": "${dir:state}/backup.sql",
       "mode": "0600",
-      "content": "SET NOCOUNT ON;\nDECLARE @n sysname, @s nvarchar(max);\nDECLARE c CURSOR LOCAL FAST_FORWARD FOR\n  SELECT name FROM sys.databases WHERE database_id > 4 AND state = 0 AND source_database_id IS NULL;\nOPEN c;\nFETCH NEXT FROM c INTO @n;\nWHILE @@FETCH_STATUS = 0\nBEGIN\n  SET @s = N'BACKUP DATABASE ' + QUOTENAME(@n) + N' TO DISK = N''/var/opt/mssql/backup/' + REPLACE(@n, N'''', N'''''') + N'.bak'' WITH INIT, COPY_ONLY, CHECKSUM';\n  EXEC (@s);\n  FETCH NEXT FROM c INTO @n;\nEND\nCLOSE c;\nDEALLOCATE c;\n"
+      "template": "files/backup.sql"
     }
   ],
   "build": {
@@ -159,6 +163,11 @@
           "MESH_RECEIVES": "${dir:grants}/mesh.json",
           "MESH_MSSQL_READER_PASSWORD_FILE": "${dir:state}/reader.secret"
         }
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
       }
     ]
   }