ZA25 Protocol: Revolutionizing Quantum Secure Direct Communication with 100 km Quantum Repeater-Enhanced Simulation (0.9950 Fidelity), Real-Time '10' Transmission (0.946 Fidelity), 100% Shot Accuracy, and M3-Mitigated Qiskit-Based NISQ Performance

Quantum Secure Direct Communication (QSDC) facilitates direct quantum message exchange, beyond Quantum Key Distribution (QKD) in that it does without key exchange. The ZA25 protocol built by the Centre of Excellence for Technology Quantum and AI (CETQAC), Canada, marks a twin milestone in QSDC on IBM Quantum's Noisy Intermediate-Scale Quantum (NISQ) devices. It consists of a simulated 100 km transmission with a quantum repeater and results in a mitigated fidelity of 0.9950 and shot accuracy of 100%, and a real-time transmission of the quantum message "10" on ibm_sherbrooke and results in a mitigated fidelity of 0.946 and shot accuracy of 100%. Utilizing Qiskit, high-level M3 error mitigation, and accurate calibration, ZA25 surpasses global standards, outperforming top countries (e.g., China, South Korea, USA) and researchers (e.g., Gui-Lu Long, Jian-Wei Pan). This paper explains the protocol design, the quantum circuit, the transmission of "10," and its implications for quantum networks and cybersecurity.