[#17]:svarga:fix, heatmap title empty-position UB crashing plot_grid CI#18
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…itle position — fixes plot_grid on gcc-13/clang
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Closes #17. Valgrind: title::ostream dereferenced an empty optional<position_t> (title without explicit position, e.g. in a grid) → uninitialized variant → std::bad_variant_access aborting plot_grid on gcc-13/clang. Fix: title::ostream uses position.value_or(default); heatmap_render gives the title a sensible default position when missing. Valgrind-clean + ctest 5/5. Base: staging.