chore(repo): Sync generated state after e2e cleanup

Regenerate canonical registry artifacts after removing the synthetic
merge-batch end-to-end fixture.

This drops the remaining bundle, catalog, plugin, and skills index
references so validate:references passes again on main.

data/plugin-compatibility.json

@@ -15697,25 +15697,6 @@
       },
       "runtime_files": []
     },
-    {
-      "id": "merge-batch-e2e-test",
-      "path": "skills/merge-batch-e2e-test",
-      "targets": {
-        "codex": "supported",
-        "claude": "supported"
-      },
-      "setup": {
-        "type": "none",
-        "summary": "",
-        "docs": null
-      },
-      "reasons": [],
-      "blocked_reasons": {
-        "codex": [],
-        "claude": []
-      },
-      "runtime_files": []
-    },
     {
       "id": "mermaid-expert",
       "path": "skills/mermaid-expert",
@@ -26253,10 +26234,10 @@
     }
   ],
   "summary": {
-    "total_skills": 1373,
+    "total_skills": 1372,
     "supported": {
-      "codex": 1343,
-      "claude": 1359
+      "codex": 1342,
+      "claude": 1358
     },
     "blocked": {
       "codex": 30,