chore(config): switch default model to github-copilot/gpt-5.3-codex

Author: assafdori

opencode/opencode.json

@@ -1,12 +1,12 @@
 {
   "$schema": "https://opencode.ai/config.json",
-  "model": "opencode/big-pickle",
+  "model": "github-copilot/gpt-5.3-codex",
   "autoupdate": true,
   "agent": {
     "code-reviewer": {
       "description": "Reviews code for best practices and potential issues",
       "mode": "subagent",
-      "model": "github-copilot/claude-sonnet-4.6",
+      "model": "github-copilot/gpt-5.3-codex",
       "prompt": "You are a code reviewer. Focus on security, performance, and maintainability.",
       "tools": {
         "write": false,