Changes in version 0.1.0 (2026-03-16)                  

  - Initial CRAN release.
  - core_packages(): list the 6 auto-attached ecosystem packages.
  - r4sub_packages(): show all packages with version and attachment
    status.
  - r4sub_status(): check which ecosystem packages are installed.
  - r4sub_conflicts(): detect function name conflicts with other loaded
    packages.
  - r4sub_news(): print NEWS for each ecosystem package.
  - r4sub_cite(): print citation information for regulatory or academic
    use.
  - Startup message can be suppressed with options(r4sub.quiet = TRUE).