wordlexpr -- compile-time Wordle
summary
Implements a playable Wordle that runs entirely at C++ compile time by encoding game state in types, taking a seed and each guess as preprocessor defines, and advancing by recompiling. Uses non-type template parameters and a mutable compile-time string type to force the compiler to print game output via an instantiation error. Keeps state as a POD struct encoded/decoded to strings and needs a compile-time RNG; works on Clang but GCC currently prints unusable hex.
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