T29: inside herdr the right column follows herdr's focused pane: herdr keeps its panes' OSC 7, so on macOS and Linux a session that finds herdr's client leading its pty's foreground reads the focused pane's folder from herdr's socket, found as herdr 0.9 finds it

src/term/mod.rs

@@ -1,6 +1,8 @@
 mod boxes;
 mod find;
 pub mod frame;
+#[cfg(unix)]
+mod herdr;
 pub mod ink;
 pub mod input;
 pub mod keys;