Add WANDB API key to GitHub Actions test workflow

- Include WANDB_API_KEY secret in test environment variables
- Ensure Weights & Biases integration is supported during testing

Author: knowsuchagency

.github/workflows/tests.yml

@@ -42,6 +42,7 @@ jobs:
           LANGFUSE_SECRET_KEY: ${{ secrets.LANGFUSE_SECRET_KEY }}
           LANGFUSE_PUBLIC_KEY: ${{ vars.LANGFUSE_PUBLIC_KEY }}
           LANGFUSE_HOST: ${{ vars.LANGFUSE_HOST }}
+          WANDB_API_KEY: ${{ secrets.WANDB_API_KEY }}
         run: |
           # Note: Some tests are expected to be skipped based on model capabilities
           uv run pytest -v -n auto tests/