Replace CPM with FetchContent and update GoogleTest to v1.18.0.
Add compiler toolchains and Debug, Release, and sanitizer presets.
Require CMake 4.0, use target properties for compiler settings,
and enable compilation database export.
Fix skeleton compilation errors and adopt trailing return types,
nodiscard execute methods, and noexcept signatures. Update CI
and project documentation without implementing any TODOs.
Validated Windows builds and tests in all three configurations.
Document the project purpose, bounded-context navigation philosophy,
intended C++ CLI direction, and incremental benchmarking goals.
Add compact agent instructions and a project map for the existing
starter scaffolding. Clarify that CLI examples are provisional and
repo-lens functionality is not yet implemented.