Add CI workflows for build, lint, and tests

[fjlaubscher]

Summary

• set up GitHub Actions for building and linting with Prettier
• add a separate workflow to run Vitest

Testing

• yarn prettier --check .
• yarn vitest run --passWithNoTests

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https://chatgpt.com/codex/tasks/task_e_6842ce9203e4832690dcbd5a4fc87329

[Copilot]

Pull Request Overview

This PR introduces CI workflows for automated building, linting with Prettier, and running Vitest, and pins the project to a specific Yarn version.

• Add a packageManager field in package.json to enforce Yarn 1.22.22.
• Create a Test workflow (.github/workflows/test.yml) to run Vitest on pushes and PRs.
• Create a Build and Lint workflow (.github/workflows/build.yml) to run Prettier checks and build on pushes and PRs.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
package.json	Added packageManager entry for consistent Yarn use.
.github/workflows/test.yml	New workflow to install deps and run Vitest tests.
.github/workflows/build.yml	New workflow to install deps, check Prettier, and build.

[Copilot]

Node version '22' may not be supported on the hosted runner; consider using a published LTS like '18.x' or '20.x'.

Suggested change

	node-version: '22'
	node-version: '20.x'

[Copilot]

Node version '22' may not be supported on the hosted runner; consider using a published LTS like '18.x' or '20.x'.

Suggested change

	node-version: '22'
	node-version: '20'

[Copilot]

[nitpick] The checkout, setup-node, and install steps are duplicated across workflows. Consider extracting them into a reusable workflow or composite action to reduce repetition.

[Copilot]

[nitpick] The checkout, setup-node, and install steps are duplicated across workflows. Consider extracting them into a reusable workflow or composite action to reduce repetition.