perf(skills): optimize sleeps and modularize duplication with multi-agent consensus PASS

- OP-1: Implement reactive _wait_session_gone in lib.sh and stop_session.sh with set -e || true guard
- OP-2: Event-driven MQTT subscribe handshake with sub_pid liveness in delegate-job
- OP-3: Replace CPU time.sleep(0.5) spin with threading.Event wait in reconcile.sh
- OP-4: Define mam_tmux dispatcher targeting resolved _REAL_TMUX_PATH to prevent recursion
- OP-6 & OP-7: Add token variables and bash version source check in lib.sh
- Integrate approved optimization plan and PASS review reports from all agents

.agents/skills/multi-agent-mux-monitor/scripts/reconcile.sh

@@ -239,17 +239,29 @@ if not state['connected']:
     client.loop_stop()
     sys.exit(3)
 
+import threading
+stop_event = threading.Event()
 start = time.time()
 try:
     while True:
         now = time.time()
-        if timeout and (now - start) >= timeout:
-            print(f"MQTT Monitor: --timeout {timeout}s reached, exiting", flush=True)
+        wall_left = (timeout - (now - start)) if timeout else None
+        idle_left = (idle_timeout - (now - state['last_msg'])) if idle_timeout else None
+        
+        next_timeout = 5.0
+        if wall_left is not None:
+            next_timeout = min(next_timeout, wall_left)
+        if idle_left is not None:
+            next_timeout = min(next_timeout, idle_left)
+            
+        if next_timeout <= 0:
+            if wall_left is not None and wall_left <= 0:
+                print(f"MQTT Monitor: --timeout {timeout}s reached, exiting", flush=True)
+            else:
+                print(f"MQTT Monitor: --idle-timeout {idle_timeout}s reached, exiting", flush=True)
             break
-        if idle_timeout and (now - state['last_msg']) >= idle_timeout:
-            print(f"MQTT Monitor: --idle-timeout {idle_timeout}s reached, exiting", flush=True)
-            break
-        time.sleep(0.5)
+            
+        stop_event.wait(timeout=next_timeout)
 finally:
     client.loop_stop()
     try: