chore: switch package manager to pnpm

[styfle]

Summary

• replace Yarn lock/config with pnpm lock/workspace configuration
• pin pnpm 10.33.0 via packageManager and configure minimumReleaseAge
• allow the existing @zeit/git-hooks install build under pnpm
• keep the existing zeit-eslint lint command by declaring @zeit/eslint-config-base, which provides that bin, as a direct dev dependency for pnpm
• replace CircleCI with a simple GitHub Actions workflow using setup-node, Corepack, pnpm install, and pnpm test
• update docs to reference pnpm commands

Testing

• pnpm exec zeit-eslint --version
• corepack enable pnpm && pnpm install && pnpm test

  

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	github/​actions/​setup-node@​49933ea5288caeca8642d1e84afbd3f7d6820020
	github/​actions/​checkout@​34e114876b0b11c390a56381ad16ebd13914f8d5

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