fix(uninstall): reconcile extension-only installs

scripts/commands/uninstall.ps1

@@ -18,7 +18,7 @@ $generated = Join-Path $root 'generated'
 $targets = @(Get-InstallTargets -Generated $generated -HomePath $homePath -Shell 'bash' -Client $Client)
 $installedTargets = @($targets | Where-Object { Test-Path -LiteralPath (Get-ManagedManifestPath $_.Destination) })
 
-if (-not $DryRun -and $installedTargets.Count -eq 0) { throw 'Not installed, nothing to uninstall.' }
+if (-not $DryRun -and $installedTargets.Count -eq 0 -and -not (Test-Path -LiteralPath (Join-Path $homePath '.my-ai-configuration/extensions.json'))) { throw 'Not installed, nothing to uninstall.' }
 
 if (-not $DryRun -and -not $Force) {
     if ([Console]::IsInputRedirected -or $env:CI -eq 'true' -or $env:AI_CONFIG_NO_INTERACTIVE -eq '1') {

scripts/commands/uninstall.sh

@@ -30,7 +30,7 @@ installed_count=0
 for target_pair in "${targets[@]}"; do
   [ -f "$(manifest_path "${target_pair#*|}")" ] && installed_count=$((installed_count + 1))
 done
-if [ "$dry_run" = false ] && [ "$installed_count" -eq 0 ]; then
+if [ "$dry_run" = false ] && [ "$installed_count" -eq 0 ] && [ ! -f "$home_path/.my-ai-configuration/extensions.json" ]; then
   printf 'Not installed, nothing to uninstall.\n' >&2
   exit 1
 fi