Fix GitHub Actions workflow

- Disable pixi cache to avoid pixi.lock issues
- Update example commands to use actual example files
- Fix test count in summary (46 not 79)

Co-Authored-By: Warp <agent@warp.dev>

Author: Mjboothaus

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Setup pixi
       uses: prefix-dev/setup-pixi@v0.8.1
       with:
-        cache: true
+        cache: false
 
     - name: Check Mojo version
       run: pixi run mojo-version
@@ -30,9 +30,9 @@ jobs:
 
     - name: Run examples
       run: |
-        pixi run example-simple
-        pixi run example-pixi
+        mojo -I src examples/read_example.mojo
+        mojo -I src examples/write_example.mojo
 
     - name: Test summary
       if: always()
-      run: echo "✅ All 79 tests passed"
+      run: echo "✅ All 46 tests passed"