Joseph Doherty ee7e190fab Add multi-client subscription sync and concurrency integration tests ...

9 tests verifying server handles multiple simultaneous OPC UA clients:

Subscription sync:
- 3 clients subscribe to same tag, all receive data changes
- Client disconnect doesn't affect other clients' subscriptions
- Client unsubscribe doesn't affect other clients' subscriptions
- Clients subscribing to different tags receive only their own data

Concurrency:
- 5 clients browse simultaneously, all get identical results
- 5 clients browse different nodes concurrently, all succeed
- 4 clients browse+subscribe simultaneously, no interference
- 3 clients subscribe+browse concurrently, no deadlock (timeout-guarded)
- Rapid connect/disconnect cycles (10x), server stays stable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-25 06:54:47 -04:00

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