Bound stream queue depth to prevent unbounded memory growth#42
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TopicStream, GoalStream, and Channel queues grew without limit when next() was not called fast enough, causing unbounded memory consumption. - TopicStream: use QoS depth as max queue size - GoalStream: accept max_depth via send_goal() (default kDefaultStreamDepth=10) - Channel: accept max_depth in constructor (default kDefaultStreamDepth=10) Oldest messages are dropped when the queue exceeds max_depth. GoalStream preserves kComplete events to avoid losing final results.
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