Improving Robustness of Tabular Retrieval via Representational Stability An Intelligent Fault Diagnosis Method for General Aviation Aircraft Based on Multi-Fidelity Digital Twin and FMEA Knowledge Enhancement A Co-Evolutionary Theory of Human-AI Coexistence: Mutualism, Governance, and Dynamics in Complex Societies End-to-End Learning for Partially-Observed Time Series with PyPOTS Universal Transformers Need Memory: Depth-State Trade-offs in Adaptive Recursive Reasoning