Threshold-Sweep QCA // Provides threshold sweep methods for Qualitative Comparative Analysis (QCA). Implements Condition Threshold Sweep-Single (CTS-S), Condition Threshold Sweep- Multiple (CTS-M), Outcome Threshold Sweep (OTS), and Dual Threshold Sweep (DTS) for systematic exploration of threshold calibration effects on crisp-set QCA results. These methods extend traditional robustness approaches by treating threshold variation as an exploratory tool for discovering causal structures. Also provides Fiss (2011) doi:10.5465/amj.2011.60263120 core/peripheral condition classification via compute_fiss_core() and generate_fiss_chart(), enabling four-symbol configuration charts that distinguish core conditions (present in both parsimonious and intermediate solutions) from peripheral conditions (intermediate only). Built on top of the 'QCA' package by Dusa (2019) doi:10.1007/978-3-319-75668-4, with function arguments following 'QCA' conventions. Based on set- theoretic methods by Ragin (2008) doi:10.7208/chicago/9780226702797.001.0001 and established robustness protocols by Oana and Schneider (2024) doi:10.1177/00491241211036158. This package supersedes 'TSQCA'; see the NEWS file for migration guidance.