chore: migrate Changesets to v3

[jan-kubica]

Upgrade the Changesets CLI and GitHub changelog plugin to their v3-compatible releases. Update the config schema and select oxfmt explicitly.

Summary by CodeRabbit

• Chores
  • Updated release-management tooling configuration.
  • Added formatting configuration for generated change documentation.
  • Updated changelog and command-line release tooling to newer versions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 1fc9d4e0-ce0f-403e-95d2-b10e3bed8055

📥 Commits

Reviewing files that changed from the base of the PR and between cc8e198 and 894ae48.

⛔ Files ignored due to path filters (1)

• bun.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• .changeset/config.json
• package.json

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The PR updates the Changesets schema to 4.0.0, enables the oxfmt format, and upgrades the Changesets changelog and CLI development dependencies.

Changes

Changesets configuration and tooling

Layer / File(s)	Summary
Update Changesets configuration and tooling .changeset/config.json, package.json	The configuration now references schema 4.0.0 and sets format to oxfmt. The Changesets changelog package updates to 1.0.0, and the CLI updates to 3.0.0.

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 894ae

This PR updates Changesets compatibility, configuration, and formatter selection; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: migrating the Changesets CLI to v3 and related configuration updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/changesets-v3

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