Use GitHub issues for questions or reproducible bug reports. Include package versions, a small runnable example and sessionInfo(); remove private data and machine-specific paths. Documentation corrections are welcome.
Changes to numerical formulas, preprocessing, tuning grids or default behavior must be reviewed explicitly. Preserve compatibility and retain the frozen reproduction engines and seeds. Use bounded deterministic tests; do not add production simulations to installation, checks or documentation builds.
Build and check each package locally before proposing a change. Building the shared site is documented in tools/build-site.R and requires pkgdown.