v0.0.67

• Added max_depth option to directory listing tool
  • Updated OllamaChat::Tools::DirectoryStructure#execute to accept max_depth parameter
  • Enhanced OllamaChat::Utils::AnalyzeDirectory#generate_structure to handle max_depth limit
  • Implemented depth and height computation for directory entries
  • Added depth pruning functionality to remove children beyond the specified depth limit
  • Attached :depth and :height metadata to each directory entry in JSON output
  • Refactored internal helper method recurse_generate_structure to track entry depth
  • Updated documentation comments to reflect new behavior
  • Added comprehensive test coverage for max_depth functionality
  • Added depth-pruning test cases in specification files