Workflow Graph Engine Smoke Tests

This directory now keeps only a small Dify-owned smoke layer around the external graphon package.

Retained coverage focuses on:

1. Dify workflow layers:
   • layers/test_llm_quota.py
   • layers/test_observability.py
2. Human-input resume integration:
   • test_parallel_human_input_join_resume.py
3. One mocked tool/chatflow smoke path:
   • test_tool_in_chatflow.py

The helper modules below remain only because the retained smoke tests use them:

1. test_mock_config.py
2. test_mock_factory.py
3. test_mock_nodes.py
4. test_table_runner.py

Examples:

uv run --project api --dev pytest api/tests/unit_tests/core/workflow/graph_engine/layers/test_llm_quota.py
uv run --project api --dev pytest api/tests/unit_tests/core/workflow/graph_engine/layers/test_observability.py
uv run --project api --dev pytest api/tests/unit_tests/core/workflow/graph_engine/test_parallel_human_input_join_resume.py
uv run --project api --dev pytest api/tests/unit_tests/core/workflow/graph_engine/test_tool_in_chatflow.py