fix: compile private hook config on Windows

Signed-off-by: Will Killian <wkillian@nvidia.com>

Author: willkill07

crates/cli/src/hooks/config.rs

@@ -3,9 +3,11 @@
 
 //! Private, installer-owned configuration for generated coding-agent hooks.
 
-use std::io::Read;
 use std::path::{Path, PathBuf};
 
+#[cfg(unix)]
+use std::io::Read;
+
 use serde::{Deserialize, Serialize};
 
 use crate::agents::CodingAgent;