🧪 [Testing Improvement] Add test for cache configuration update

[undivisible]

🎯 What: The testing gap addressed was the lack of unit test to ensure that with_cache builder correctly updates the cache_capacity and cache_ttl.
📊 Coverage: The test covers the happy path to guarantee that cache_settings() yields exactly what was provided via with_cache(capacity, ttl).
✨ Result: Enhanced test coverage ensures no future regressions concerning standard object manipulation within SearchConfig.

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PR created automatically by Jules for task 6866043697458891038 started by @undivisible

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Note

Low Risk
Test-only change with no runtime or API behavior impact.

Overview
Adds a unit test search_config_with_cache_updates_capacity_and_ttl in src/lib.rs so SearchConfig::with_cache(128, 120s) is checked via cache_settings() for the expected capacity and TTL.

No production code changes—only test coverage for the existing builder/getter pair on SearchConfig.

^{Reviewed by Cursor Bugbot for commit 9471fa6. Configure here.}

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