dcvar 0.1.0

Scope and documentation

• Clarified that the package currently implements Gaussian-copula models only.
• Marked the multilevel and SEM variants as experimental extensions with narrower diagnostic support than the core single-level models.
• Documented PIT diagnostics as posterior-mean plug-in diagnostics and made the unsupported multilevel and SEM paths explicit in the help pages.
• Clarified the current scope of loo() support across model classes.

Build and submission hygiene

• Excluded local *-test-local.log artifacts from source builds.
• Added package citation metadata.

Testing

• Added skew-normal fit coverage for dcvar() and dcvar_hmm().
• Added PIT smoke coverage for gamma and skew-normal margins.