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In this commit, we make the gossip filter semaphore capacity configurable through a new FilterConcurrency field. This change allows node operators to tune the number of concurrent gossip filter applications based on their node's resources and network position. The previous hard-coded limit of 5 concurrent filter applications could become a bottleneck when multiple peers attempt to synchronize simultaneously. By making this value configurable via the new gossip.filter-concurrency option, operators can increase this limit for better performance on well-resourced nodes or maintain conservative values on resource-constrained systems. We keep the default value at 5 to maintain backward compatibility and avoid unexpected resource usage increases for existing deployments. The sample configuration file is updated to document this new option.