ci: add workflow to sync production into main

[duncanleo]

Motivation

• Keep main (staging) aligned with production by creating an automated sync PR when production is updated.

Description

• Add a GitHub Actions workflow at .github/workflows/sync-production-to-main.yml that triggers on pushes to production and manual dispatch and uses repo-sync/pull-request@v2 to open a PR from production → main with pull-requests: write permissions.

Testing

• Ran npm run verify which completed successfully.

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Codex Task

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/add-ci-workflow-for-production-sync

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[duncanleo]

superseded by #107