modeldiag 0.1.0

• Initial CRAN submission.
• Added diagnose_model() generic function with methods for:
  • Linear models (lm)
  • Generalized linear models (glm) with binomial and poisson families
  • Cox proportional hazards models (coxph)
• Implemented comprehensive diagnostic tests:
  • Multicollinearity (VIF)
  • Heteroscedasticity (Breusch-Pagan test)
  • Autocorrelation (Durbin-Watson test)
  • Normality (Shapiro-Wilk test)
  • Influential observations (Cook’s distance, dfbetas)
  • Overdispersion (Poisson models)
  • Zero-inflation (Poisson models)
  • Proportional hazards (Cox models)
  • Linearity of logit (Logistic models)
  • Goodness of fit (Hosmer-Lemeshow test)
• Added print(), summary(), and plot() methods for diagnostic results
• Comprehensive plotting capabilities for visual diagnostics
• Full documentation with roxygen2
• Unit tests with testthat