Rust Audio (rodio) on WSL2

Problem

Compiling and running Rust projects using rodio (or cpal) for audio on WSL2 fails at two stages:

1. Compile time: Missing ALSA development headers
2. Runtime: ALSA can't find audio devices because WSL2 uses PulseAudio via WSLg

Context / Trigger Conditions

Compilation Error

The system library `alsa` required by crate `alsa-sys` was not found.
The file `alsa.pc` needs to be installed and the PKG_CONFIG_PATH environment variable must contain its parent directory.