feat(t3code): add new sonnet 5 favorite

Author: khaneliman

modules/home/programs/terminal/tools/t3code/default.nix

@@ -304,6 +304,10 @@ in
                 provider = "claudeAgent";
                 model = "claude-opus-4-8";
               }
+              {
+                provider = "claudeAgent";
+                model = "claude-sonnet-5";
+              }
               {
                 provider = "codex";
                 model = "gpt-5.5";