chore: upgrade Changesets to CLI v3 and action v2

[SutuSebastian]

Summary

• @changesets/cli 3.0.1 + @changesets/changelog-github 1.0.0.
• changesets/action@v2.1.1 with version-script / publish-script / pr-title / commit-message / create-github-releases.
• scripts/release.ts writes CHANGESETS_OUTPUT git-tag events so action v2 can push tags and create GitHub releases (stdout New tag: is no longer read).
• Private apps stay unversioned via CLI v3 defaults (no ignore workaround).

Replaces #65 (GitHub closed it when the branch was renamed).

Test plan

• Release job on merge no longer errors on CLI v3 / unexpected inputs
• bunx changeset status runs under CLI 3
• Next Version PR still titles chore: version packages

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4540628

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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📥 Commits

Reviewing files that changed from the base of the PR and between 558173d and 4540628.

⛔ Files ignored due to path filters (1)

• bun.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• .changeset/config.json
• .github/workflows/release.yml
• package.json
• scripts/release.ts

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