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running `CARGO_LOG=debug cargo test --package engine` is failing for me with:
```   0.899509305s DEBUG main:exec: cargo::core::compiler: Not including path /home/tdyas/.pyenv/versions/3.12.4/lib in runtime library search path because it is outside target root /home/tdyas/Projects/Pants/pants/src/rust/engine/target/debug
     Running unittests src/lib.rs (target/debug/deps/engine-282feabd434f2c95)
/home/tdyas/Projects/Pants/pants/src/rust/engine/target/debug/deps/engine-282feabd434f2c95: error while loading shared libraries: libpython3.12.so.1.0: cannot open shared object file: No such file or directory
   0.903789682s DEBUG main:exec: cargo: display_error; err=test failed, to rerun pass `-p engine --lib````
The first message hints that `cargo` is not including the runtime lib directory needed for the test invocation.

I'm more concerned that this is not picking up python 3.9 though. Has anyone had any similar experiences?

`src/rust/engine/build.rs` looks for changes in PY config variable but pyo3 loos at `PYO3_PYTHON` for python interpreter overrides\

I had set `PY` to `$HOME/.pyenv/shims/python3.9`

never mind, I am invoking `cargo` directly and our top-level `./cargo` wrapper sets `PYO3_PYTHON` before invoking cargo.