feat: add `kwargs` support for `completion` calls#13

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lakshyaag wants to merge 3 commits intoalexzhang13:mainfrom

lakshyaag:feat/completion-kwargs

Commits on Jan 5, 2026

Enhance completion methods to accept additional kwargs for more flexible API calls across various clients and handlers.
lakshyaag
committed
Add basic tests for OpenAIClient completion methods with and without kwargs
lakshyaag
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fix: update MockLM implementations to match new BaseLM signature with model and kwargs parameters
lakshyaag
committed