T34: prompts and commands carry OSC 133 marks: the tap reads every OSC body and hands 133's marks to the session, which keeps its last command's status; zsh, bash, fish and PowerShell mark what the shell leaves unmarked, and the user's prompt still sees the status

src/term/mod.rs

@@ -8,6 +8,7 @@ pub mod keys;
 mod links;
 #[cfg(target_os = "macos")]
 pub mod mac;
+mod marks;
 pub mod mouse;
 mod paint;
 mod pointer;