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.
• bun run release is still changeset publish, which inherits CHANGESETS_OUTPUT from the action.
• Drop the persist-docs ignore — CLI v3 does not version private packages.

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: 3cbda36

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 d83047b and 3cbda36.

⛔ Files ignored due to path filters (1)

• bun.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

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

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