Consolidated branch work: modernize the CMake layout and developer workflow,
expand GitLab CI for multiple OS images and Docker, and align documentation
and tooling with the new pipeline.

Build / CMake
- Rework CMake structure (e.g. CMakeGraphVizOptions under cmake/), presets,
  and examples integration; update googletest and nlohmann_json.
- Genetic layout and related sources; test executable naming; easylogging
  include path fix for examples.

CI / GitLab
- Multi-OS matrix and per-OS jobs, workflow rules (tags, MR, default branch),
  draft-MR skip, secondary OS matrix gating.
- Docker: build/push helpers, context-unchanged skip, Harbor login (stdin,
  fallbacks, protected-variable hints), dind/network fixes for runners.
- Quality: pinned clang-format 18 venv, cppcheck/lint alignment, lcov 2+
  and coverage settings, sanitizer packages and parallelism caps.
- Release/suggest-version scripting and related CI glue.

Documentat...