0.3.1

Add CI/CD improvements based on template best practices:

• Add detect-code-changes.mjs for smart change detection
• Add check-version.mjs to prevent manual package.json version changes
• Add check-changesets.mjs to check for pending changesets
• Add merge-changesets.mjs to merge multiple changesets on release
• Update workflow with detect-changes job, conditional changeset checks,
  and improved concurrency configuration

Related Pull Request: #21

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