Want to design a Washing Machine SImulator, and it's HLD, LLD, Design, code in C++ and stress tests.

I am trying to build a C++ consumer washing machine with realistic state transitions, safety interlocks, and usability modes. The simulator will be used to validate logic, concurrency handling, and event-driven control flow without physical hardware
as this asked in interview and nothing is available on internet.

https://redd.it/1qrvqfm
@r_cpp