intervalpsych 0.1.0

• Initial CRAN submission.
• Implements the Interval Consensus Model (ICM) for interval-valued responses using ‘Stan’ for ‘Bayesian’ estimation (Kloft et al., 2024 doi:10.31234/osf.io/dzvw2).
• Provides ILR/SLR transformations, simplex conversions, model fitting via fit_icm(), and visualization functions.
• Includes quantifiers example dataset.