⚡ Bolt: Add in-memory cache to SearchTool

[thirdbase1]

💡 What: Implemented a Map-based in-memory cache inside the SearchTool.deep method.
🎯 Why: Prevents redundant API calls/operations when the agent queries the same context repeatedly during loops.
📊 Impact: Expected to significantly reduce latency on repetitive search operations by serving them instantly from memory instead of executing identical requests.
🔬 Measurement: Verified caching logic via unit test suite (npm run test). Can be observed through faster subsequent queries in agentic operation.

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PR created automatically by Jules for task 12130865429978828113 started by @thirdbase1

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