fix(codex): auto-cleanup broken model_catalog_json on install/update

All scripts now detect and fix leftover damage from previous installs:
- Remove model_catalog_json from config.toml (crashes Codex on startup)
- Delete stale model_catalog.json file
- Detect broken TOML with dotted key bug
Both PS1 scripts and Python patcher handle cleanup before patching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

codex/codex_patcher.py

@@ -458,9 +458,20 @@ def apply_all_patches(config, home_dir=None):
     print(f"  Proxy:   {config['base_url']}")
     print()
 
+    # Clean up stale model_catalog.json from previous broken installs
+    stale_catalog = os.path.join(codex_dir, "model_catalog.json")
+    if os.path.isfile(stale_catalog):
+        os.remove(stale_catalog)
+        print(f"  {YELLOW}Removed stale model_catalog.json{RESET}")
+
     # Read existing config
     existing = read_toml(config_path)
 
+    # Remove model_catalog_json if present (wrong format crashes Codex)
+    if "model_catalog_json" in existing:
+        del existing["model_catalog_json"]
+        print(f"  {YELLOW}Removed model_catalog_json from config (unsupported format){RESET}")
+
     # Backup before any changes
     backup_file(config_path)