sh: redefine sigintr during agent turn to interrupt without exiting

scripts/s/sh

@@ -192,8 +192,7 @@ S=$MOUNT/s/$id
 
 fn sigintr {
 	printf '\n' >[1=2]
-	if(is_idle) exit 0
-	echo stop > $S/ctl
+	exit 0
 }
 
 chat_off=0
@@ -274,6 +273,8 @@ done; exit 1'}
 		case *
 			printf '%s\n' $"input > $S/prompt || { printf 'submit failed\n' >[1=2] }
 
+			fn sigintr { printf '\n' >[1=2]; echo stop > $S/ctl }
+
 			cat $S/statewait >/dev/null >[2]/dev/null
 
 			while(! is_idle) {
@@ -286,6 +287,8 @@ done; exit 1'}
 				sleep 0.05
 			}
 
+			fn sigintr { printf '\n' >[1=2]; exit 0 }
+
 			n=`{wc -c < $S/chat >[2]/dev/null}
 			if(~ $#n 0) n=0
 			if(test $n -gt $chat_off) {