mvardlurt 1.0.0

• Initial CRAN release.
• Implements the multivariate ARDL unit root test (Sam, McNown, Goh & Goh, 2024).
• Features:
  • Automatic lag selection via AIC/BIC
  • Bootstrap critical values for correct size
  • Three deterministic cases (none, intercept, intercept + trend)
  • Four-case decision framework for inference
  • Comprehensive print and summary methods
  • Diagnostic plots