Declare every module's data; the backup holder measures it (hq ADR 0233)

Backup lines are derived from each module's data section instead of written by hand; the holder
measures declared items, reads the array under them, and deletes a retired item only after a last
restore point; the Go providers say each held consumer's size so an empty replacement is seen.

modules/ollama/module.json

@@ -25,6 +25,17 @@
       "model": "llama3.2"
     }
   },
+  "data": {
+    "own": [
+      {
+        "id": "models",
+        "path": "${dir:state}",
+        "class": "rebuildable",
+        "backup": "none",
+        "why": "models, downloaded again, and too large to copy every night"
+      }
+    ]
+  },
   "resources": [
     {
       "id": "state",