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-delegate-job/multi-agent-mux-delegate-job

@@ -116,7 +116,23 @@ cmd_submit() {
         >"$logf" 2>&1 &
     local sub_pid=$!
     echo "subscriber pid: $sub_pid (log: $logf)"
-    sleep 1  # give the subscriber time to CONNACK + SUBSCRIBE before the agent runs
+    # Wait for the subscriber to CONNACK + SUBSCRIBE (reactive handshake)
+    local sub_ready=0
+    for ((i = 0; i < 25; i++)); do
+      if kill -0 "$sub_pid" 2>/dev/null; then
+        if grep -q '^SUBSCRIBED ' "$logf" 2>/dev/null; then
+          sub_ready=1
+          break
+        fi
+      else
+        echo "ERROR: subscriber died early (pid=$sub_pid, check $logf)" >&2
+        exit 1
+      fi
+      sleep 0.2
+    done
+    if [ "$sub_ready" -ne 1 ]; then
+      echo "WARNING: subscriber subscribe handshake timed out — falling back to proceed" >&2
+    fi
 
     # 3) run the agent (or print the command for dry-run / missing binary)
     local pub="$PY $SCRIPT_DIR/scripts/publish_event.py --registry-dir $REGISTRY_DIR --job $JOB_ID"
@@ -202,7 +218,23 @@ Task: $PROMPT"
           >"$logf" 2>&1 &
       local sub_pid=$!
       echo "subscriber pid: $sub_pid (log: $logf)"
-      sleep 1
+      # Wait for the subscriber to CONNACK + SUBSCRIBE (reactive handshake)
+      local sub_ready=0
+      for ((i = 0; i < 25; i++)); do
+        if kill -0 "$sub_pid" 2>/dev/null; then
+          if grep -q '^SUBSCRIBED ' "$logf" 2>/dev/null; then
+            sub_ready=1
+            break
+          fi
+        else
+          echo "ERROR: subscriber died early (pid=$sub_pid, check $logf)" >&2
+          exit 1
+        fi
+        sleep 0.2
+      done
+      if [ "$sub_ready" -ne 1 ]; then
+        echo "WARNING: subscriber subscribe handshake timed out — falling back to proceed" >&2
+      fi
 
       # Format instruction block
       local pub="$PY $SCRIPT_DIR/scripts/publish_event.py --registry-dir $REGISTRY_DIR --job $JOB_ID"

.agents/skills/multi-agent-mux-delegate-job/scripts/job_subscriber.py

@@ -185,8 +185,13 @@ def main(argv=None) -> int:
         if rc != 0:
             logger.warning("broker disconnected (rc=%s); will retry reconnect", reason_code)
 
+    def on_subscribe(_c, _u, mid, granted_qos, _props=None):
+        for topic in subscribed_topics:
+            print(f"SUBSCRIBED {topic}", flush=True)
+
     client.on_connect = on_connect
     client.on_disconnect = on_disconnect
+    client.on_subscribe = on_subscribe
     client.reconnect_delay_set(min_delay=1, max_delay=16)
     mqtt_common.with_retry(
         lambda: client.connect(config.host, config.port, config.keepalive),