Add Blackwell-Auto and set as default model

opencode.json

@@ -62,6 +62,15 @@
             "low": { "reasoningEffort": "low" }
           }
         },
+        "Blackwell-Auto": {
+          "name": "Blackwell-Auto",
+          "reasoning": true,
+          "variants": {
+            "high": { "reasoningEffort": "high" },
+            "medium": { "reasoningEffort": "medium" },
+            "low": { "reasoningEffort": "low" }
+          }
+        },
         "Qwen3-4B-Instruct-2507-GGUF-Q4_K_XL": {
           "limit": { "context": 32768, "output": 32768 },
           "name": "Qwen3-4b"
@@ -69,6 +78,6 @@
       }
     }
   },
-  "model": "zuccaro/GLM-5.3-Flash",
+  "model": "zuccaro/Blackwell-Auto",
   "small_model": "zuccaro/Qwen3.8-27B-NVFP4"
 }