Implements comprehensive change_signature functionality:
- add_parameter: Add new parameters with optional defaults and type hints
- remove_parameter: Remove parameters by name or index
- rename_parameter: Rename parameters across definition and call sites
- reorder_parameters: Reorder parameters and update all call sites
- change_default: Modify default values
Features:
- Full Python, JavaScript/TypeScript, and Go signature parsing
- Automatic call site detection and transformation
- Handles complex nested arguments and string literals
- Preview mode to review changes before applying
- Parallel processing for large codebases
Also adds 11 new tests for change_signature functionality.
Version bump to 0.9.9