don't fail on unknown default model

[p-]

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[Copilot]

Pull request overview

This PR updates the agent’s default-model selection logic so the module no longer raises at import time when AI_API_ENDPOINT is an unrecognized host, shifting toward a more tolerant configuration approach.

Changes:

• Replace the “unsupported endpoint” ValueError with a fallback default_model string for unknown endpoints.
• Minor formatting adjustments to logging.debug(...) and OpenAIChatCompletionsModel(...) calls.

Comments suppressed due to low confidence (1)

src/seclab_taskflow_agent/agent.py:46

• This change alters behavior for unsupported AI_API_ENDPOINT values (it no longer raises at import-time), but there’s no test coverage asserting the new behavior. Adding a unit test that sets an unsupported AI_API_ENDPOINT and verifies importing/initializing the agent uses an env-provided model (or emits the expected warning / raises a clear initialization-time error) would prevent regressions.

    case _:
        default_model = "please-set-default-model-via-env"

DEFAULT_MODEL = os.getenv("COPILOT_DEFAULT_MODEL", default=default_model)

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