Fix zeromq test hang

[liquidsec]

Summary

• The zeromq test hung for 1200s on CI due to ZeroMQ's PUB/SUB "slow joiner" race -- messages published before the subscription propagates are silently dropped, causing socket.recv() to block forever
• This became a consistent failure after the subprocess engine elimination made scans near-instant, shrinking the window for subscription propagation to near-zero
• Fix: capture events by wrapping socket.send() on the module's PUB socket during the scan, which tests the same code path (handle_event -> serialize -> send) without any timing dependency
• Verified 10/10 passes locally (vs ~80% before)

[github-actions]

🚀 Performance Benchmark Report

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90%. Comparing base (ef65b09) to head (045fb9c).

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #3214   +/-   ##
=====================================
- Coverage     90%     90%   -0%     
=====================================
  Files        453     453           
  Lines      46101   46104    +3     
=====================================
- Hits       41211   41210    -1     
- Misses      4890    4894    +4     

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