opencode: unpin the work profile's agents from gpt-5.6-terra-low

common/opencode/work.json

@@ -399,20 +399,10 @@
     }
   },
   "agent": {
-    "dev": {
-      "model": "litellm/chatgpt/gpt-5.6-terra-low"
-    },
-    "architect": {
-      "model": "litellm/chatgpt/gpt-5.6-terra-low"
-    },
-    "review": {
-      "model": "litellm/chatgpt/gpt-5.6-terra-low"
-    },
-    "duck": {
-      "model": "litellm/chatgpt/gpt-5.6-terra-low"
-    },
-    "brainstorm": {
-      "model": "litellm/chatgpt/gpt-5.6-terra-low"
-    }
+    "dev": {},
+    "architect": {},
+    "review": {},
+    "duck": {},
+    "brainstorm": {}
   }
 }