fix: force duckdb wheel usage

[ObservedObserver]

Summary

• require duckdb 0.10.4+ so prebuilt wheels are available on newer interpreters
• force pip to install a prebuilt duckdb wheel during CI runs

Testing

• pip install --disable-pip-version-check -e . (fails: proxy blocking PyPI access)

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https://chatgpt.com/codex/tasks/task_e_690bdcc8e28c83228dab659b4b6ce563

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Note

Enforces prebuilt duckdb wheel usage in CI and raises minimum duckdb version to 0.10.4.

• CI:
  • Set PIP_ONLY_BINARY="duckdb" in .github/workflows/auto-ci.yml to enforce wheel install during "Try Installing" step.
• Dependencies:
  • Bump duckdb requirement in pyproject.toml from >=0.10.1 to >=0.10.4 (still <2.0.0).

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