fix(tinyagent): Handle uses_openai when using gateway provider.

[daavoo]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/any_agent/frameworks/tinyagent.py	72.72% <100.00%> (ø)
tests/unit/frameworks/test_tinyagent.py	100.00% <100.00%> (ø)

... and 74 files with indirect coverage changes

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