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This commit implements the BBR-TC-01 test case in the Nexus simulation framework to verify that a Backbone Router (BBR) device automatically sends its BBR dataset to the Leader if none exists in the network. To support the Host receiving echo replies on its infrastructure interface, the Nexus InfraIf class is extended to support custom ICMPv6 Echo Reply handlers. Key changes: - Implement BBR-TC-01 C++ test case and Python verification script. - Add EchoReplyHandler callback and registration to Nexus InfraIf. - Update InfraIf::Receive to handle and dispatch ICMPv6 Echo Replies. - Register 1_2_BBR_TC_1 in CMake and the test runner script.