Add cmuxterm CLI and socket control modes

scripts/notify_probe.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Probe common desktop-notification escape sequences.
+# NOTE: cmux suppresses notifications when the app + surface are focused,
+# so switch to another app/window while this runs.
+
+esc=$'\033'
+bel=$'\007'
+st="${esc}\\"
+
+send_seq() {
+  local label="$1"
+  local seq="$2"
+  printf '\n[%s]\n' "$label"
+  printf '%b' "$seq"
+}
+
+sleep_between() {
+  # Ghostty rate limits notifications (~1/sec) and suppresses identical
+  # content within a short window, so keep spacing + unique content.
+  sleep 1.2
+}
+
+send_seq "OSC 9 (iTerm2) body-only, BEL terminator" "${esc}]9;cmux OSC 9 BEL $RANDOM${bel}"
+sleep_between
+
+send_seq "OSC 9 (iTerm2) body-only, ST terminator" "${esc}]9;cmux OSC 9 ST $RANDOM${st}"
+sleep_between
+
+send_seq "OSC 777 (rxvt) notify, BEL terminator" "${esc}]777;notify;cmux OSC 777 BEL $RANDOM;body ${RANDOM}${bel}"
+sleep_between
+
+send_seq "OSC 777 (rxvt) notify, ST terminator" "${esc}]777;notify;cmux OSC 777 ST $RANDOM;body ${RANDOM}${st}"
+
+printf '\nDone.\n'