src/agent/executor.rs

use std::process::Command;

pub fn run_in_nix(cmd: &str, packages: Vec<&str>) -> String {
    let pkgs = packages.join(" ");
    let output = Command::new("nix-shell")
        .arg("-p")
        .arg(pkgs)
        .arg("--run")
        .arg(cmd)
        .output()
        .expect("failed to execute nix command");

    String::from_utf8_lossy(&output.stdout).to_string()
}