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* Added configurable InfiniBand (IB) signaling mode. `EndpointConfig::Ib::Mode` enum selects the mode (`Default`, `Host`, `HostNoAtomic`). `Default` is equivalent to `Host` unless specified different by envrionment `MSCCLPP_IBV_MODE`. `Host` corresponds to the previous implementation using RDMA atomics for signaling, while `HostNoAtomic` uses write-with-immediate instead. * Regarding updates in Python bindings and API.