alice calls /api/v1/notify → target=ai:bob
  notify returned HTTP 404
settle 6s for notification fanout
bob queries his inbox on node-2
  bob inbox has 0 messages; sees marker: False
charlie queries his inbox on node-3 (must NOT see it)
Traceback (most recent call last):
  File "/home/runner/work/ai-memory-ai2ai-gate/ai-memory-ai2ai-gate/scripts/scenarios/32_inbox_notify.py", line 87, in <module>
    main()
  File "/home/runner/work/ai-memory-ai2ai-gate/ai-memory-ai2ai-gate/scripts/scenarios/32_inbox_notify.py", line 57, in main
    charlie_inbox = _inbox(h, h.node3_ip, "ai:charlie")
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/ai-memory-ai2ai-gate/ai-memory-ai2ai-gate/scripts/scenarios/32_inbox_notify.py", line 23, in _inbox
    _, resp = h.http_on(ip, "GET", f"/api/v1/inbox?agent_id={agent_id}&limit=50",
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/ai-memory-ai2ai-gate/ai-memory-ai2ai-gate/scripts/a2a_harness.py", line 136, in http_on
    result = self.ssh_exec(node_ip, remote_cmd, timeout=timeout)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/ai-memory-ai2ai-gate/ai-memory-ai2ai-gate/scripts/a2a_harness.py", line 78, in ssh_exec
    return subprocess.run(
           ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/subprocess.py", line 550, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/subprocess.py", line 1209, in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/subprocess.py", line 2116, in _communicate
    self._check_timeout(endtime, orig_timeout, stdout, stderr)
  File "/usr/lib/python3.12/subprocess.py", line 1253, in _check_timeout
    raise TimeoutExpired(
subprocess.TimeoutExpired: Command '['ssh', '-o', 'StrictHostKeyChecking=no', '-o', 'ConnectTimeout=10', '-o', 'ServerAliveInterval=5', 'root@167.99.59.68', "curl -sS -X GET 'http://127.0.0.1:9077/api/v1/inbox?agent_id=ai:charlie&limit=50' -H 'Content-Type: application/json' -H 'X-Agent-Id: ai:charlie'"]' timed out after 30 seconds