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Migrate Direct OpenAI Usage

Prompt:

Migrate this OpenAI-only integration to nxusKit without changing app behavior.

Starter fixture: examples/fixtures/starters/direct-openai-python/

Expected behavior:

  • Inspect imports, client construction, model selection, message shape, retry behavior, and public function signatures.
  • Present a preserved-behavior contract before editing.
  • Keep OPENAI_API_KEY and OPENAI_MODEL conventions unless the project already uses different names.
  • Replace direct provider SDK calls with nxusKit provider calls.
  • Avoid adding new abstractions that the project did not need.

Verification:

Terminal window
python -m py_compile app.py
python -c "import inspect, app; print(inspect.signature(app.summarize))"

Good result:

  • The public API remains summarize(text: str) -> str.
  • No direct OpenAI SDK import remains in the implementation.