Tests are missing from repo

The README says:

> ## Project Organization
>
> ```
> src/ Compiler source code (Rust)
> frontend/ C source -> typed AST (preprocessor, lexer, parser, sema)
> ir/ Target-independent SSA IR (lowering, mem2reg)
> passes/ SSA optimization passes (15 passes + shared loop analysis)
> backend/ IR -> assembly -> machine code -> ELF (4 architectures)
> common/ Shared types, symbol table, diagnostics
> driver/ CLI parsing, pipeline orchestration
>
> include/ Bundled C headers (x86 SIMD: SSE through AVX-512, AES-NI, FMA, SHA, BMI2; ARM NEON)
> tests/ Compiler tests (each test is a directory with main.c and expected output)
> ideas/ Future work proposals and improvement notes
> ```

But the tests directory is not actually there! Is this on purpose?