refactor(utils): apply coding standards to utils module

[ryanmccann1024]

Description:
This PR applies the FUSION coding standards to the fusion/utils module, improving code quality, readability, and maintainability. The changes include function renaming for clarity, comprehensive docstring additions, improved type annotations, and input validation.

🔧 Type of Change

Primary Change Type:

• 🐛 Bug Fix - Non-breaking change that fixes an issue
• ✨ New Feature - Non-breaking change that adds functionality
• 💥 Breaking Change - Change that would cause existing functionality to break
• 🔄 Refactor - Code change that neither fixes a bug nor adds a feature
• 📚 Documentation - Documentation only changes
• 🧪 Tests - Adding missing tests or correcting existing tests
• 🏗️ Build/CI - Changes to build process or CI configuration
• 🎨 Style - Code style changes (formatting, missing semicolons, etc.)
• ⚡ Performance - Performance improvements
• 🔒 Security - Security vulnerability fixes

Component(s) Affected:

• CLI Interface (fusion/cli/)
• Configuration System (fusion/configs/)
• Simulation Core (fusion/core/)
• ML/RL Modules (fusion/modules/rl/, fusion/modules/ml/)
• Routing Algorithms (fusion/modules/routing/)
• Spectrum Assignment (fusion/modules/spectrum/)
• SNR Calculations (fusion/modules/snr/)
• Visualization (fusion/visualization/)
• GUI Interface (fusion/gui/)
• Unity/HPC Integration (fusion/unity/)
• Testing Framework (tests/)
• Documentation
• GitHub Workflows (.github/)
• Build/Dependencies

🧪 Testing

Test Coverage:

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• Existing tests still pass
• Performance impact assessed

Test Details:

• Updated all existing unit tests to use new function names
• Added validation tests for new input validation logic
• Verified all imports and function calls work correctly
• Ensured backward compatibility through comprehensive refactoring

Test Configuration Used:

# Standard test configuration - no changes needed
[general_settings]
# Tests run with existing configurations

Commands to Reproduce Testing:

# Run unit tests for utils module
python -m pytest tests/test_os_utils.py -v
python -m pytest tests/test_random_utils.py -v

# Run all tests to ensure no regressions
python -m pytest tests/ -v

# Test imports work correctly
python -c "from fusion.utils import create_directory, set_random_seed; print('Imports successful')"

Test Results:

• Operating System: macOS 15.0.0 (Darwin 25.0.0)
• Python Version: 3.11+
• Test Environment: Local development

📊 Impact Analysis

Performance Impact:

• No performance impact
• Performance improved
• Minor performance decrease (acceptable)
• Significant performance impact (needs discussion)

Memory Usage:

• No change in memory usage
• Memory usage optimized
• Minor increase in memory usage
• Significant memory impact

Backward Compatibility:

• Fully backward compatible
• Minor breaking changes with migration path
• Major breaking changes (requires version bump)

Dependencies:

• No new dependencies
• New dependencies added (list in Additional Notes)
• Dependencies removed/updated

🔄 Migration Guide

Breaking Changes:

• create_dir() renamed to create_directory()
• set_seed() renamed to set_random_seed()
• get_uniform_rv() renamed to generate_uniform_random_variable()
• get_exponential_rv() renamed to generate_exponential_random_variable()
• Parameter names updated for consistency

Migration Steps:

1. Update all imports to use new function names
2. Update all function calls throughout codebase
3. Update any configuration or string references
4. Update test files and mocks

Before/After Examples:

# Before (old usage)
from fusion.utils.os import create_dir
from fusion.utils.random import set_seed, get_uniform_rv

create_dir("/path/to/directory")
set_seed(42)
value = get_uniform_rv(10.0)

# After (new usage)  
from fusion.utils.os import create_directory
from fusion.utils.random import set_random_seed, generate_uniform_random_variable

create_directory("/path/to/directory")
set_random_seed(42)
value = generate_uniform_random_variable(10.0)

✅ Code Quality Checklist

Architecture & Design:

• Follows established architecture patterns
• Code is modular and follows separation of concerns
• Interfaces are well-defined and documented
• Error handling is comprehensive
• Logging is appropriate and informative

Code Standards:

• Code follows project style guidelines
• Variable and function names are descriptive
• Code is properly commented
• Complex logic is documented
• No dead code or unused imports

Configuration & CLI:

• CLI arguments follow established patterns
• Configuration validation updated (if needed)
• Schema updated for new config options
• Backward compatibility maintained for configs

Security:

• No sensitive information hardcoded
• Input validation performed where needed
• No security vulnerabilities introduced
• Dependencies scanned for vulnerabilities

📚 Documentation

Documentation Updates:

• Code comments added/updated
• API documentation updated
• User guide/tutorial updated
• Configuration reference updated
• CHANGELOG.md updated
• README updated (if needed)

Examples Added:

• Usage examples in docstrings
• Configuration examples
• CLI usage examples
• Integration examples

🚀 Deployment

Deployment Considerations:

• Safe to deploy to all environments
• Requires environment-specific configuration
• Needs database migration (if applicable)
• Requires manual steps (document below)

Manual Steps Required:
No manual deployment steps required - all changes are code-level refactoring.

🔍 Review Guidelines

For Reviewers:

• PR description is clear and complete
• Code changes align with described functionality
• Tests are comprehensive and pass
• Documentation is adequate
• No obvious security issues
• Performance impact is acceptable

Review Focus Areas:

• Verify all function name changes are consistent
• Check that all imports have been updated correctly
• Ensure docstrings follow Sphinx format correctly
• Validate input validation logic is appropriate

📝 Additional Notes

Summary of Changes:

• 23 files changed with 217 insertions and 135 deletions
• Function renames: 4 utility functions renamed for clarity
• Documentation: Added comprehensive Sphinx-format docstrings
• Type safety: Improved type annotations and input validation
• Error handling: Added meaningful error messages and validation

Files Modified:

• Core utilities: fusion/utils/os.py, fusion/utils/random.py, fusion/utils/__init__.py
• 15 production files updated with new function names
• 5 test files updated for new function signatures

Open Questions:
None - this is a straightforward refactoring following established patterns.

Future Work:

• Continue applying coding standards to other modules
• Consider adding more comprehensive input validation
• Add performance benchmarks for utility functions

Related PRs:

• Part of ongoing coding standards initiative
• Follows similar refactoring in routing, SNR, spectrum, reporting, sim, and unity modules

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🏁 Final Checklist

Before submitting this PR, confirm:

• I have followed the contributing guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published