refactor(r-lib): prefix all skill names with r-*

[gadenbuie]

Summary

Renames all r-lib/ skills to use a consistent r-* prefix so names are self-describing across categories, and documents the naming convention in CONTRIBUTING.md.

Renames

• cli → r-cli
• cran-extrachecks → r-cran-extrachecks
• lifecycle → r-lifecycle
• mirai → r-mirai
• testing-r-packages → r-testthat (matches the package-named pattern of r-cli, r-lifecycle, r-mirai)

Migration

Verify the migration

Run the repo's new find-stale-references.py utility against any project to find lingering references to the old names:

./find-stale-references.py ~/my-project
# or, high-confidence path references only
./find-stale-references.py --kinds path ~/my-project

Claude Code

If you installed via the plugin marketplace (Methods 1–2 in the README), no manual work is needed — the renames ship as part of the r-lib plugin. Update the plugin and the new skill names replace the old ones:

claude plugin marketplace update posit-dev-skills
claude plugin update r-lib@posit-dev-skills

Or in a Claude Code session, run /plugin and choose Update on the r-lib plugin (restart Claude Code afterwards to pick up the changes).

If you installed with npx skills, use the commands below — add -a claude-code to target Claude Code only.

If you installed the renamed skills globally with the skills CLI, remove the old names and install the new ones:

npx skills remove -g cli cran-extrachecks lifecycle mirai testing-r-packages
npx skills add posit-dev/skills -g \
  --skill r-cli \
  --skill r-cran-extrachecks \
  --skill r-lifecycle \
  --skill r-mirai \
  --skill r-testthat

The other r-lib skills (r-cli-app, r-cran-status, r-package-development, r-tidyverse-style) are unchanged and need no action. Alternatively, remove all globally installed Posit skills and re-add the ones you want:

npx skills remove -g --skill '*' -y
npx skills add posit-dev/skills -g --skill '*' -y

Reference updates

• name: frontmatter in each renamed SKILL.md
• .claude-plugin/marketplace.json, root README.md, CLAUDE.md
• Cross-references in r-lib/r-tidyverse-style and posit-dev/review-testing

r-lib/README.md audit

• Added missing sections for r-cli-app and r-package-development
• Corrected the alt-text note (lives at repo root; shared across r-lib and quarto plugins)
• Refreshed the Potential Skills list (removed items now covered by existing skills)

CI fix

• .github/scripts/validate-skills.sh only failed CI on the validator's error exit code (1); it previously treated warnings-only runs (exit 2) as failures, so pre-existing warnings could fail unrelated PRs. Warnings still appear in the job summary.
• Rewrote the r-testthat description as prose so it no longer reads as a keyword list.

CONTRIBUTING.md

• Added guidance to prefer category-based name prefixes (r-*, shiny-*, quarto-*, connect-*) when reasonable