Fix channel-open cancellation deadlock in ConnectionService#154

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Commits on Jul 22, 2026

Fixed a channel-open deadlock by disposing the cancellation registration after releasing the lock.
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Commits on Jul 23, 2026

Added deterministic unit and integration tests for the channel-open cancellation deadlock, using a small internal ConnectionService hook reached by reflection (matching how ReconnectTests reaches K…
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Replace the timing-dependent Thread.Sleep(500) in the deadlock test hook with an explicit synchronization handshake using TaskCompletionSource and CancellationToken LIFO callback ordering. A second…
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