chore: add Renovate config for GitHub Actions

[JonahMMay]

Problem

Keep CI GitHub Actions updated without noisy Go module PRs across first-party plugin repos.

Approach

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

Depends on merging the prairie-server Renovate presets PR first: Prairie-Server/prairie-server#20

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 avoids duplicate SDK bump PRs across plugins

  

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8f5fb42e-ac0e-4017-9a42-dbdcc8e9264a

📥 Commits

Reviewing files that changed from the base of the PR and between 8e3fef7 and 1c8ff64.

📒 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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