ci: add Claude review for pull requests

[kanywst]

Adds the Claude review workflow used across kanywst repos, with a generic prompt that reads this repo's README / CLAUDE.md / CONTRIBUTING.md and CI first. Uses the 0-draft org secret CLAUDE_CODE_OAUTH_TOKEN. The action refuses to run when this file differs from the default branch, so it takes effect from the next PR after merge.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 52d8a60f-8ab8-46ee-9e8d-f14ba4b2cf55

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• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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