PSor 0.1.0

CRAN resubmission

• Revised the Description field in DESCRIPTION to cite the methodological reference in CRAN-recommended form with authors, year, and DOI.
• Removed unnecessary \dontrun{} and \donttest{} wrappers where feasible.
• Reduced example sizes so package examples run during checking.
• Refined documentation and examples in response to CRAN reviewer comments.