chore(settings): remove model pin (claude-fable-5[1m] override)

Drop the top-level "model" key so the session falls back to the
default model instead of forcing claude-fable-5[1m].

Co-Authored-By: Claude <noreply@anthropic.com>

settings.json

@@ -186,7 +186,6 @@
     "disableBypassPermissionsMode": "disable",
     "additionalDirectories": []
   },
-  "model": "claude-fable-5[1m]",
   "hooks": {
     "SessionStart": [
       {