Dedupe-only pass for BASE_SHA..HEAD: remove duplicate code introduced by the diff or reuse existing shared utils; applies changes + commits.
$npx -y skills add besimple-oss/broccoli --skill dedupInstalls into the current project.
Run `npx skills use "https://github.com/besimple-oss/broccoli" --skill "besimple-oss/broccoli/dedup"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/besimple-oss/broccoli" that are relevant to the current task. Run `npx skills add "https://github.com/besimple-oss/broccoli"` and select the relevant skills, then follow their instructions.