feat: Introduce model alias resolution, enhanced configuration options, and improved OpenAI/Claude adapter handling for responses, embeddings, and tool calls.

opencode.json.example

@@ -9,6 +9,12 @@
         "apiKey": "your-api-key"
       },
       "models": {
+        "gpt-4o": {
+          "name": "GPT-4o (aliased to deepseek-chat)"
+        },
+        "gpt-5-codex": {
+          "name": "GPT-5 Codex (aliased to deepseek-reasoner)"
+        },
         "deepseek-chat": {
           "name": "DeepSeek Chat (DS2API)"
         },
@@ -18,5 +24,5 @@
       }
     }
   },
-  "model": "ds2api/deepseek-chat"
+  "model": "ds2api/gpt-5-codex"
 }