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* Revert `MSCCLPP_FIFO_USE_TAIL_REPLICA=1` back to the default. * Optimize `FifoDeviceHandle`. * Do not use `cudaHostAllocWriteCombined` that increases latency. * Pin host memory for `Host2DeviceSemaphore::outboundSemaphore_`. * Fix proxy NUMA binding issues. * Prevent graph capture inside proxy threads. * Now `CudaIpcConnection` skips stream sync when unnecessary. * Now any type of connection needs to hold a shared pointer to the context for memory safety. * Now a context should be always managed by a shared pointer for memory safety. * Minor docs & interface improvements. * Minor fix in `mscclpp-test` correctness test.