feat: find_files tool

feat(code_analysis): add FileSearchService with cross-platform search and fallback
feat(code_analysis): add get_find_files_tool_definition and handler for LLM tools
refactor(code_analysis): update tool.py to register file search tool alongside code analysis tools
test(file_search_service): add comprehensive unit tests covering all FileSearchService functionality

Author: lewistransts

AgentCrew/modules/code_analysis/__init__.py

@@ -1,5 +1,15 @@
+"""
+Code Analysis Module
+
+This module provides code structure analysis using tree-sitter and file search
+capabilities with platform-specific optimizations.
+"""
+
 from .service import CodeAnalysisService
+from .file_search_service import FileSearchService, FileSearchError
 
 __all__ = [
     "CodeAnalysisService",
+    "FileSearchService",
+    "FileSearchError",
 ]