feat(directory_tree): add excludePatterns support & documentation (#623)

- Update documentation with directory_tree declaration
- Add excludePatterns parameter to DirectoryTreeArgsSchema
- Implement pattern exclusion in buildTree function using minimatch
- Pass excludePatterns through recursive calls
- Support both simple and glob patterns for exclusion
- Maintain consistent behavior with search_files implementation

* Add tests and fix implementation

---------

Co-authored-by: Ola Hungerford <olahungerford@gmail.com>
Co-authored-by: Adam Jones <adamj+git@anthropic.com>
Co-authored-by: Adam Jones <adamj@anthropic.com>

src/filesystem/README.md

@@ -153,6 +153,19 @@ The server's directory access control follows this flow:
   - Case-insensitive matching
   - Returns full paths to matches
 
+- **directory_tree**
+  - Get recursive JSON tree structure of directory contents
+  - Inputs:
+    - `path` (string): Starting directory
+    - `excludePatterns` (string[]): Exclude any patterns. Glob formats are supported.
+  - Returns:
+    - JSON array where each entry contains:
+      - `name` (string): File/directory name
+      - `type` ('file'|'directory'): Entry type
+      - `children` (array): Present only for directories
+        - Empty array for empty directories
+        - Omitted for files
+    
 - **get_file_info**
   - Get detailed file/directory metadata
   - Input: `path` (string)