Summary

Phase 3 of the C++20 Module Migration EPIC (#256). With all module files created across all 8 systems (Phase 1, 1.5, 2 complete), this issue tracks the stabilization work needed before production release.

Parent Epic

Part of #256 (C++20 Module Migration - Cross-System Preparation)

Prerequisites

• Phase 1: Prerequisites (4/4 completed)
• Phase 1.5: Additional Cleanup (3/3 completed)
• Phase 2: Module File Creation (8/8 completed)

Sub-Issues (common_system)

Scope

Systems to Stabilize

Tasks

Testing

• Verify all unit tests pass with module build (-DCOMMON_BUILD_MODULES=ON)
• Run integration tests across all systems with modules enabled
• Test cross-system module imports work correctly
• Verify header-only build still works (backward compatibility)

Performance Validation

• Benchmark module build times vs header-only build
• Verify no runtime performance regression
• Document compile-time improvements

Documentation

• Update README to reflect module support status
• Remove "experimental" tag from C++20 module references
• Add module usage examples to documentation
• Update ARCHITECTURE.md with module structure
• Create MODULE_MIGRATION.md guide

Compiler Compatibility

• Verify builds on Clang 16+
• Verify builds on GCC 14+
• Verify builds on MSVC 2022 17.4+
• Document AppleClang limitations

Acceptance Criteria

• All tests pass with modules enabled on supported compilers
• Performance benchmarks documented
• No runtime regression detected
• Documentation complete
• CI/CD updated to test module builds
• "experimental" tag removed from documentation

Estimated Timeline

2-4 months

Success Metrics

• 100% test pass rate with modules
• Compile time improvement documented
• Zero runtime performance regression
• Complete documentation

Notes

• Each system should be stabilized independently
• Maintain header compatibility throughout transition
• Report any circular dependency issues discovered during testing