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

PRD.md

@@ -44,6 +44,7 @@ Ghostty is the bar for what the terminal does. ELYTerminal owns its engine on `a
 
 - PTY: alacritty's `tty` and event loop. The pty is wrapped so its reader passes bytes through an OSC 7 scanner. The scanner reports the working directory.
 - Shell integration for zsh, bash, fish and PowerShell, injected at launch as Ghostty does: each prompt sends OSC 7 and a title. A shell without integration reports nothing, and the panels say so.
+- Inside herdr, which keeps its panes' OSC 7, the session's folder is that of herdr's focused pane, read from herdr's socket while herdr's client runs in the foreground, on macOS and Linux.
 - Grid: colors (named, 256, truecolor, OSC 4/10/11/12), bold, dim, italic, underline (single, double, curly, dotted, dashed), strikethrough, inverse, hidden, wide characters, combining marks.
 - Box drawing (U+2500–U+257F), block elements (U+2580–U+259F) and powerline shapes (U+E0B0–U+E0B7) painted as geometry, so lines and segments join across cells.
 - Fonts: JetBrains Mono by default, any installed font by choice; Nerd Font icons the font lacks come from a bundled Nerd Font.