test: cover Xquik search OpenAPI shape

[kriptoburak]

Summary

• Add an IR builder fixture for Xquik searchTweets.
• Assert the x-api-key header security scheme is retained.
• Verify aliased query parameters, defaults, and operation security alternatives.

Tests

• uv run pytest tests/test_builder.py -q
• uv run ruff check tests/test_builder.py

[kriptoburak]

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