chore: add Renovate config for GitHub Actions

[JonahMMay]

Problem

Keep CI GitHub Actions updated without noisy Go module PRs for this catalog repo.

Approach

Add renovate.json extending github>prairie-server/prairie-server//renovate-presets/actions-only.

Depends on merging the prairie-server Renovate presets PR first.

Testing

JSON validated with json.load. Config-only change.

AI Disclosure

• Tool(s): Cursor Cloud Agent
• Model(s): Composer
• Involvement: Authored config and PR
• Adversarial review: Actions-only to avoid duplicate SDK/module bump noise

  

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: aabf7bb0-ca60-4bdc-8f14-9bf79c9614c3

📥 Commits

Reviewing files that changed from the base of the PR and between ced6a29 and 89d971f.

📒 Files selected for processing (1)

• renovate.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/renovate-config-3fbd

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