Wave group in the 1D period domain does not conserve energy. likely some CFL-like condition. look at `test/manual/B01_1D_regtest_wave_growth.jl` <img width="1350" height="1100" alt="Image" src="https://github.com/user-attachments/assets/421d50eb-a270-41a7-9b62-0185f738b3c1" />
Wave group in the 1D period domain does not conserve energy. likely some CFL-like condition.
look at
test/manual/B01_1D_regtest_wave_growth.jl