Remove Codecov integration and add dependency diff workflow

[bartveneman]

Summary

Mirrors projectwallace/stylelint-plugin#232:

• Removed: Codecov upload step from the test job, CODECOV_TOKEN env var from the build job, and the @codecov/rollup-plugin dependency (including its usage in tsdown.config.ts)
• Added: New dependency-diff.yml workflow that packs the base and PR branches and runs e18e/action-dependency-diff to comment on PRs with a dependency/bundle size diff

Test plan

• pnpm test passes (254 tests)
• pnpm run build succeeds without the Codecov plugin
• pnpm run check (typecheck) passes
• pnpm run lint passes
• No remaining codecov/CODECOV references in the repo
• Dependency Diff workflow runs on this PR and posts a bundle size comparison

---

Generated by Claude Code

[github-actions]

⚠️ Duplicate Dependencies (found: 22, threshold: 1)

📦 Package	📋 Versions
@babel/parser	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 root@ tsdown@0.22.3 rolldown-plugin-dts@0.26.0 @babel/generator@8.0.0 @babel/parser@8.0.0
@babel/types	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 @babel/types@7.29.7 root@ tsdown@0.22.3 rolldown-plugin-dts@0.26.0 @babel/generator@8.0.0 @babel/parser@8.0.0 @babel/types@8.0.0
@babel/helper-string-parser	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 @babel/types@7.29.7 @babel/helper-string-parser@7.29.7 root@ tsdown@0.22.3 ... @babel/parser@8.0.0 @babel/types@8.0.0 @babel/helper-string-parser@8.0.0
@babel/helper-validator-identifier	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 @babel/types@7.29.7 @babel/helper-validator-identifier@7.29.7 root@ tsdown@0.22.3 ... @babel/parser@8.0.0 @babel/types@8.0.0 @babel/helper-validator-identifier@8.0.2
@rolldown/binding-wasm32-wasi	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-wasm32-wasi@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-wasm32-wasi@1.1.5
picomatch	2 versions root@ @vitest/coverage-v8@4.1.9 ... tinyglobby@0.2.17 fdir@6.5.0 picomatch@4.0.4 root@ @vitest/coverage-v8@4.1.9 vitest@4.1.9 @vitest/mocker@4.1.9 vite@8.1.4 picomatch@4.0.5
rolldown	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 root@ @vitest/coverage-v8@4.1.9 vitest@4.1.9 @vitest/mocker@4.1.9 vite@8.1.4 rolldown@1.1.5
@oxc-project/types	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @oxc-project/types@0.137.0 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @oxc-project/types@0.139.0
@rolldown/binding-android-arm64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-android-arm64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-android-arm64@1.1.5
@rolldown/binding-darwin-arm64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-darwin-arm64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-darwin-arm64@1.1.5
@rolldown/binding-darwin-x64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-darwin-x64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-darwin-x64@1.1.5
@rolldown/binding-freebsd-x64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-freebsd-x64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-freebsd-x64@1.1.5
@rolldown/binding-linux-arm-gnueabihf	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-arm-gnueabihf@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-arm-gnueabihf@1.1.5
@rolldown/binding-linux-arm64-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-arm64-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-arm64-gnu@1.1.5
@rolldown/binding-linux-arm64-musl	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-arm64-musl@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-arm64-musl@1.1.5
@rolldown/binding-linux-ppc64-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-ppc64-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-ppc64-gnu@1.1.5
@rolldown/binding-linux-s390x-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-s390x-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-s390x-gnu@1.1.5
@rolldown/binding-linux-x64-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-x64-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-x64-gnu@1.1.5
@rolldown/binding-linux-x64-musl	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-x64-musl@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-x64-musl@1.1.5
@rolldown/binding-openharmony-arm64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-openharmony-arm64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-openharmony-arm64@1.1.5
@rolldown/binding-win32-arm64-msvc	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-win32-arm64-msvc@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-win32-arm64-msvc@1.1.5
@rolldown/binding-win32-x64-msvc	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-win32-x64-msvc@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-win32-x64-msvc@1.1.5

💡 To find out what depends on a specific package, run: pnpm -r why example-package

🎉 Package Size Decrease

📦 Package	📏 Base Size	📏 Source Size	📈 Size Change
@projectwallace/format-css	8.6 kB	8.6 kB	-19 B