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Split functional tests into 4 parallel groups and add check-functional-parallel target (~3x faster CI runs). Add branch-aware LCOV coverage reporting with new --enable-coverage option and lcov summary in CI pipeline. Enable ccache via -C configure flag for faster recompilations. Install lcov in all Docker images and use --depth 1 git clones + parallel make -j$(nproc) for quicker container builds. Update CONTRIBUTING.md with instructions for parallel test groups and adding new ones. All changes are tightly related CI/performance improvements developed in sequence. No external service uploads (e.g. Codecov skipped due to Gitea incompatibility).