Fix Windows CI test failures

- Split "Verify test files exist" step for Unix and Windows platforms
- Use 'dir' command on Windows instead of 'ls -la'
- Fix artifact upload paths for Windows (use explicit temp path)
- Separate artifact upload steps for Windows and Unix
- Update test runner to handle Windows temp directory correctly

This should resolve the Windows test failures in GitHub Actions.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: Mrassimo

.github/workflows/ci.yml

@@ -29,13 +29,23 @@ jobs:
     - name: Install dependencies
       run: npm ci
 
-    - name: Verify test files exist
+    - name: Verify test files exist (Unix)
+      if: runner.os != 'Windows'
       run: |
         echo "Checking test files..."
         ls -la tests/unit/
         ls -la tests/tui/
         ls -la tests/fixtures/
 
+    - name: Verify test files exist (Windows)
+      if: runner.os == 'Windows'
+      run: |
+        echo "Checking test files..."
+        dir tests\unit\
+        dir tests\tui\
+        dir tests\fixtures\
+      shell: cmd
+
     - name: Run comprehensive test suite
       run: node tests/run_all_tests.js
       timeout-minutes: 10
@@ -59,13 +69,24 @@ jobs:
       if: runner.os != 'Windows'
       run: mkdir -p /tmp/datapilot-tests
 
-    - name: Upload test artifacts
-      if: always()
+    - name: Upload test artifacts (Windows)
+      if: runner.os == 'Windows' && always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-outputs-${{ matrix.os }}-${{ matrix.node-version }}
+        path: |
+          C:\Users\runneradmin\AppData\Local\Temp\*_test.txt
+          C:\Users\runneradmin\AppData\Local\Temp\datapilot-tests\*
+        retention-days: 7
+        if-no-files-found: warn
+
+    - name: Upload test artifacts (Unix)
+      if: runner.os != 'Windows' && always()
       uses: actions/upload-artifact@v4
       with:
         name: test-outputs-${{ matrix.os }}-${{ matrix.node-version }}
         path: |
-          ${{ runner.os == 'Windows' && '$env:TEMP' || '/tmp' }}/*_test.txt
-          ${{ runner.os == 'Windows' && '$env:TEMP' || '/tmp' }}/datapilot-tests/*
+          /tmp/*_test.txt
+          /tmp/datapilot-tests/*
         retention-days: 7
         if-no-files-found: warn

tests/run_all_tests.js

@@ -86,7 +86,7 @@ async function main() {
   // Run command tests with small fixture
   log('\n🔧 Command Tests', 'yellow');
   const testFile = path.join(__dirname, 'fixtures/test_sales.csv');
-  const outputDir = process.platform === 'win32' ? process.env.TEMP : '/tmp';
+  const outputDir = process.platform === 'win32' ? process.env.TEMP || 'C:\\Users\\runneradmin\\AppData\\Local\\Temp' : '/tmp';
 
   results.push(await runTest('EDA Command', 'node', [
     'bin/datapilot.js', 'eda', testFile,