fix: address PR review findings

Reject unsupported Windows architectures in the install script instead
of defaulting to x64, and assert that cancelling the API key prompt
writes no configuration.

Author: elkaix

apps/pythinker-code/test/tui/commands/auth.test.ts

@@ -121,6 +121,7 @@ describe('connectCatalogProvider credential acquisition', () => {
     await connectCatalogProvider(host, 'anthropic', CATALOG_ENTRY);
 
     expect(current().providers['anthropic']).toBeUndefined();
+    expect(host.harness.setConfig).not.toHaveBeenCalled();
     expect(promptModelSelectionForCatalog).not.toHaveBeenCalled();
   });
 });

apps/pythinker-web/public/install.ps1

@@ -455,7 +455,12 @@ if ([System.Environment]::OSVersion.Platform -ne [System.PlatformID]::Win32NT) {
 if (-not $Version) { $Version = Get-LatestVersion }
 $Version = $Version.TrimStart('v')
 
-$archLabel = if ([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture -eq [System.Runtime.InteropServices.Architecture]::Arm64) { 'arm64' } else { 'x64' }
+$architecture = [System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture
+$archLabel = switch ($architecture) {
+  ([System.Runtime.InteropServices.Architecture]::Arm64) { 'arm64' }
+  ([System.Runtime.InteropServices.Architecture]::X64) { 'x64' }
+  default { Fail "unsupported Windows architecture: $architecture (need x64 or arm64)" }
+}
 $target = "win32-$archLabel"
 
 $asset = "pythinker-code-$target.zip"