:herb: Fern Regeneration -- April 2, 2026 (#154)

* SDK regeneration

* Refactor SearchClientWrapper: Deprecate adjust_confidence_level, threshold, and sort_option parameters. Update documentation to reflect changes and clarify usage of the rank field in API responses.

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Co-authored-by: fern-api[bot] <115122769+fern-api[bot]@users.noreply.github.com>
Co-authored-by: tl-genie <genie@twelvelabs.io>