fix(cli): replace shell-based update with native Rust implementation (#7148)

Signed-off-by: JF <john.franklin@gmail.com>
Co-authored-by: JF <john.franklin@gmail.com>
Co-authored-by: Jack Amadeo <jackamadeo@squareup.com>

crates/goose-cli/src/session/editor.rs

@@ -308,6 +308,7 @@ with multiple lines.
     }
 
     #[test]
+    #[cfg(unix)]
     fn test_symlink_raii_cleanup_on_panic() {
         use std::os::unix::fs;
         use std::panic;
@@ -351,6 +352,7 @@ with multiple lines.
     }
 
     #[test]
+    #[cfg(unix)]
     fn test_symlink_creation_and_cleanup() {
         use std::os::unix::fs;