fix: exclude test_data from pre-commit file modifications

Revert changes to test data XML files and add exclude patterns
to prevent pre-commit hooks from modifying test data and example files.

Author: claude

.pre-commit-config.yaml

@@ -18,15 +18,19 @@ repos:
       - id: check-toml
       - id: debug-statements
       - id: end-of-file-fixer
+        exclude: ^(test_data|docs/example)/
       - id: trailing-whitespace
+        exclude: ^(test_data|docs/example)/
       - id: mixed-line-ending
         args: ["--fix=lf"]
+        exclude: ^(test_data|docs/example)/
 
   # Line ending normalization
   - repo: https://github.com/Lucas-C/pre-commit-hooks
     rev: "v1.5.5"
     hooks:
       - id: remove-crlf
+        exclude: ^(test_data|docs/example)/
 
   # Prettier for markdown, yaml, html, json formatting
   - repo: https://github.com/pre-commit/mirrors-prettier