Clean up technical debt

# Clean up technical debt

# Inspired by https://github.com/wcygan/dotfiles

Clean up technical debt in $ARGUMENTS.

Steps:

1. Identify cleanup targets:
   - Scan for TODO, FIXME, HACK, XXX comments
   - Find commented-out code blocks
   - Locate unused imports and variables
   - Detect unreachable/dead code
   - Identify deprecated API usage
   - Find print debug statements

2. Code quality improvements:
   - Fix linting errors and warnings
   - Apply consistent code formatting
   - Standardise naming conventions
   - Update to modern syntax (for example, type annotations)

3. Remove dead code:
   - Delete commented-out code older than 1 month
   - Remove unused functions and methods
   - Clean up unreferenced files
   - Delete obsolete configuration

4. Consolidate duplication:
   - Identify duplicate code blocks
   - Extract common functionality to utilities
   - Merge similar functions with parameters
   - Consolidate redundant type definitions
   - Unify error handling patterns

5. Update deprecated usage:
   - Replace deprecated library methods
   - Update to current API versions
   - Migrate from legacy patterns
   - Update outdated documentation references
   - Fix deprecated test patterns

6. File organization:
   - Remove empty files and directories
   - Move files to appropriate directories
   - Update incorrect file extensions
   - Fix circular dependencies

7. Documentation cleanup:
   - Remove outdated comments
   - Update incorrect documentation
   - Add missing docstrings
   - Fix broken links in docs
   - Update example code

Safety measures:

- Create git commit before each cleanup type
- Run tests after each change
- Keep refactoring commits separate
- Document why code was removed
- Preserve git history for deleted files

Output:

- Summary of cleaned items by category
- Lines of code removed
- Performance impact (if any)
- Risk assessment for changes
- Follow-up tasks identified