Fix project sync workflow YAML formatting

[zackees]

Summary

• restore newline-preserved YAML for .github/workflows/add-to-project.yml
• keep the hardened project-sync behavior from the prior PR

Validation

• fetched the branch file after update to confirm it contains normal YAML line breaks

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d09f8a84-577f-4a59-a747-bbced46abd86

📥 Commits

Reviewing files that changed from the base of the PR and between 1f56c2e and bbb6154.

📒 Files selected for processing (1)

• .github/workflows/add-to-project.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-project-sync-yaml-newlines

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