Module spawn 

Process spawning behind a CommandRunner seam (so bench/tests can inject fixture output), plus the single exit-code normalization point.

Structs

RealRunner

Production runner: actually spawns the process.

SpawnSpec

What to run and how.

Traits

CommandRunner

Abstraction over “run this command and give me its output + exit code”.

Functions

normalized_exit_code

Normalize an ExitStatus into an i32 the way a shell would: a normal exit yields its code; a signal death yields 128 + signum.