🧪 Add comprehensive test suite for json_memory/search.py

[dioncx]

🎯 What: Created missing tests for json_memory/search.py, a core module handling regex, fuzzy, full-text, and semantic searches.
📊 Coverage: Tests now verify:

• Regex Search: Field specification (path/value/both), case sensitivity, and invalid patterns handling.
• Fuzzy Search: Distance calculations logic, and match thresholds.
• Full-text Search: Multi-word processing and case sensitivity.
• Semantic Search: Fallback behavior for uninstalled FAISS/sentence-transformers and mocking results.
• Auto-routing: Unified search interface accurately delegating to the right strategy.
• Path suggestion queries.
  ✨ Result: Improved overall coverage of memory search utilities, verifying correct functionality and failure paths, enabling reliable codebase refactoring. Additionally fixed a bug where fuzzy_search was incorrectly relying only on word overlap or SequenceMatcher by returning the max() of both techniques for more robust typo handling.

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PR created automatically by Jules for task 16041900259024415038 started by @dioncx

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