ci(ci): use powershell for windows test step to fix environment access

- Split Test step into Unix and Windows variants
- Use PowerShell on Windows for proper COMSPEC and env variable access
- Keep bash for Unix platforms (ubuntu, macos)

Author: NeaByteLab

.github/workflows/ci.yaml

@@ -56,12 +56,19 @@ jobs:
       - name: Type check
         run: deno check src/index.ts
 
-      - name: Test
+      - name: Test (Unix)
+        if: runner.os != 'Windows'
         shell: bash
         run: |
-          if [ "${{ runner.os }}" = "Windows" ]; then
-            export PATH="${{ steps.node_path.outputs.node_dir_bash }}:$PATH"
-          fi
           echo "PATH: $PATH"
           which node || echo "node not in PATH"
           deno test --allow-read --allow-env --allow-run
+
+      - name: Test (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $env:PATH = "${{ steps.node_path.outputs.node_dir }};$env:PATH"
+          echo "PATH: $env:PATH"
+          Get-Command node -ErrorAction SilentlyContinue | ForEach-Object { $_.Source } | Write-Host
+          deno test --allow-read --allow-env --allow-run