T40: sessions post system notifications through gpui's: each terminal posts its own in the order its output asks, when its row turns to waiting, done or error, when a command ends, and when a program asks through OSC 9, 777 or 99, only while its window is inactive or it is hidden, one every 3 seconds, titled with the session's name; a press goes to the window whose session posted it and shows it; OSC 99 hears untracked closes, alive lists what lives, in order before a later DA1, a close and w take one back where gpui can, a closed session's too, and the query says what holds where

src/term/mod.rs

@@ -15,6 +15,7 @@ mod paint;
 mod pointer;
 mod prompts;
 mod pty;
+mod reports;
 pub mod shell;
 mod status;
 mod tap;