Function main_vcsquery 

pub fn main_vcsquery(
    args: &MainArgs,
    stdout: &mut dyn Write,
    stderr: &mut dyn Write,
) -> u8

Core logic the CLI binary runs, but with injectable deps; designed fr main()’s use-case.

NOTE: this is separate from main purely so we can e2e (ie: so we can dependency-inject stdio/stderr, etc. into PlexerQuery). For more on e2e testing a rust CLI, see:

• https://doc.rust-lang.org/book/ch11-03-test-organization.html#integration-tests-for-binary-crates
• https://rust-cli.github.io/book/tutorial/testing.html#testing-cli-applications-by-running-them

Panics

Should only panic if stderr or stdout writes fail.