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.

Replaces #56 (GitHub closed it when the branch was renamed). Includes the tinyexec lockfile collapse so bun dedupe --check passes.

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: ec77428

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

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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 ec77428.

⛔ 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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