feat: add clientOptions validation for LLM configurations with tests

[kokatesaurabh]

This PR introduces validation logic for clientOptions in LLM configurations to ensure correctness and consistency across the codebase.

Key Changes

src/utils/llm.ts

Added validateClientOptions utility to validate LLM clientOptions against provider-specific rules.

src/run.ts

Integrated validateClientOptions into the Run class, ensuring all graphs are initialized with validated client options.

src/specs/llm.utils.test.ts (new file)

Added comprehensive unit tests for validateClientOptions covering valid and invalid client options.

Why this is needed

Prevents misconfiguration of LLM client options (e.g., unsupported params for a given provider).

Improves stability and developer experience by catching errors early.

Provides test coverage for future maintainability.

Testing

All new tests in src/specs/llm.utils.test.ts pass successfully.

Existing test suite continues to pass without regressions.

[kokatesaurabh]

hey @danny-avila can u review it! i would like to contribute

[kokatesaurabh]

hello @danny-avila can u review it