The file was corrupted to only 4KB during previous edits. This restores the complete implementation with all methods including:
- workflow_summary()
- read_ticket()
- suggest_branch_name()
- create_feature_branch()
- get_branch_status()
- list_my_branches()
- apply_diff()
- _apply_unified_diff()
- _generate_diff_commit_message()
- commit_changes()
- create_pull_request()
- replace_file()
- create_file()
- get_file()
- list_files()
All with proper difflib import at module level.
Refs: #11
Removed the incorrectly placed `import difflib` line from inside
the _apply_unified_diff() method. The module is now imported at
the top of the file where it belongs.
Refs: #11
The import statement was incorrectly placed inside a function body,
which is invalid Python syntax. Moved to module-level imports.
Also updated requirements to include difflib (part of stdlib, no pip install needed).
Refs: #11
