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/ucodex_update.ps1

@@ -93,6 +93,39 @@ if ($oldVer -eq $latestVer) {
     Write-Host "  Updated: $oldVer -> $newVer" -ForegroundColor Green
 }
 
+# ---- Clean up broken config from previous runs ----
+
+$codexConfigDir = "$env:USERPROFILE\.codex"
+$codexConfigFile = "$codexConfigDir\config.toml"
+if (Test-Path $codexConfigFile) {
+    $existingContent = Get-Content $codexConfigFile -Raw -ErrorAction SilentlyContinue
+    $needsCleanup = $false
+
+    # Check 1: broken TOML with dotted model keys
+    if ($existingContent -match "gpt-5\s*=" -and $existingContent -match "\{.*:") {
+        Write-Host "  Detected broken TOML (dotted key bug)" -ForegroundColor Yellow
+        $needsCleanup = $true
+    }
+
+    # Check 2: model_catalog_json with wrong format (crashes Codex)
+    if ($existingContent -match "model_catalog_json") {
+        Write-Host "  Detected model_catalog_json (unsupported, removing)" -ForegroundColor Yellow
+        $needsCleanup = $true
+    }
+
+    if ($needsCleanup) {
+        Write-Host "  Removing broken config.toml..." -ForegroundColor Yellow
+        Remove-Item $codexConfigFile -Force -ErrorAction SilentlyContinue
+    }
+}
+
+# Clean up stale model_catalog.json
+$staleCatalog = "$codexConfigDir\model_catalog.json"
+if (Test-Path $staleCatalog) {
+    Remove-Item $staleCatalog -Force -ErrorAction SilentlyContinue
+    Write-Host "  Removed stale model_catalog.json" -ForegroundColor Yellow
+}
+
 # ---- Download and apply patches ----
 
 $pyCmd = $null