T36: programs report their status through OSC 7501, revision 0.4, checked as the spec checks them; each terminal keeps their records by id, replaced whole, cleared with those under them, 256 at most; a new prompt drops working, blocked and idle, a full reset all; the support query is answered with every state and kind, ahead of a DA1 sent after it; the pty's tests move to their own file

src/term/mod.rs

@@ -15,6 +15,7 @@ mod pointer;
 mod prompts;
 mod pty;
 pub mod shell;
+mod status;
 mod tap;
 #[cfg(unix)]
 mod unix;