- Replace daemon threads with coordinated shutdown mechanism
- Add shutdown_event for thread synchronization
- Implement proper ZMQ resource cleanup
- Wait for threads to complete before exit
- Add ZMQ timeout to allow periodic shutdown checks
- Move signal handlers into server functions for proper scope access
- Fix protobuf class names and variable references
- Simplify resource cleanup to avoid variable scope issues
Root cause: Original servers used daemon threads + direct sys.exit(0)
which interrupted ZMQ operations and prevented proper resource cleanup,
causing hangs during process termination in CI environments.
This should resolve the core pytest hanging issue without complex wrappers.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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