feat(notstrap): add new-machine bootstrap orchestrator

crates/notstrap/src/repo.rs

@@ -0,0 +1,17 @@
+use anyhow::{Context, Result};
+use std::path::Path;
+use std::process::Command;
+
+pub fn clone_if_missing(url: &str, dest: &Path) -> Result<bool> {
+    if dest.exists() {
+        return Ok(false);
+    }
+    let status = Command::new("git")
+        .args(["clone", url, dest.to_str().unwrap()])
+        .status()
+        .context("failed to run git clone")?;
+    if !status.success() {
+        anyhow::bail!("git clone {} failed", url);
+    }
+    Ok(true)
+}