Add SearchParams helper with validation and tests #404
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Summary
Add a small typed SearchParams helper for building query dicts. This helps users compose richer searches while discussion on the full Search a licious client continues.
What is included
SearchParams with light validation and to_query
Unit tests for valid and invalid inputs plus a simple pagination case
No network calls in unit tests
Why this fits
Keeps the surface area small and backward compatible. Gives a safe building block for later work on the new search endpoint.
Testing
Ran pytest locally for the new tests. The ML tests are excluded to keep the run fast and deterministic. CI should run the standard matrix.
AI note
I drafted parts of this with AI help and reviewed and tested all code myself per the project policy.
Refs #314