Update packages and package manager

[ChadKillingsworth]

• Updates project to use ES modules
• Update dependencies
• Updates yarn version and sets minimum package age requirements

[Copilot]

Pull request overview

This PR performs dependency/tooling hygiene by migrating the project to Yarn Berry (Yarn v4) lockfile format, updating a dependency version range, and aligning the publish workflow with the new package manager.

Changes:

• Migrates yarn.lock from Yarn v1 format to Yarn Berry (v4) format and updates transitive dependency resolutions accordingly.
• Updates source-map dependency from an 0.8 beta range to the stable ^0.7.6.
• Adds Yarn v4 packageManager metadata and adjusts the publish workflow to use Yarn for publishing.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

File	Description
yarn.lock	Regenerated lockfile in Yarn Berry format with updated resolved versions/checksums.
package.json	Updates source-map range and pins the expected Yarn version via packageManager.
.yarnrc.yml	Introduces Yarn Berry configuration for installs/registry behavior.
.github/workflows/publish.yml	Switches publish command from npm publish to yarn npm publish.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ChadKillingsworth]

@copilot please re-review

[Copilot]

@copilot please re-review

Both issues raised in the review have been addressed in the current state of the branch:

1. Corepack not enabled — the workflow now includes corepack enable before any Yarn commands.
2. approvedGitRepositories: ['**'] — replaced with approvedGitRepositories: [] (empty array), which restores the default safe behavior without granting a broad allowlist.

[jrobinson01]

looks good. One question.