chore: enable Renovate + CodeRabbit, retire dependabot.yml

[jonathanperis]

Summary

• Add renovate.json extending the shared preset in jonathanperis/.github
• Add .coderabbit.yaml with chill review profile + path-specific instructions
• Remove .github/dependabot.yml — Renovate takes over (security alerts auto-PRs unaffected, those are repo-level setting)

Why

Renovate (smarter grouping/scheduling) + CodeRabbit (AI code review) replace Dependabot version updates and add inline review feedback respectively. Renovate App + CodeRabbit App are already installed at the user level.

What stays

• Dependabot security updates (repo-level setting, not the yml) — Renovate also handles vulnerability alerts but two layers is fine
• All workflow CI unchanged

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 83867487-fc99-4057-a3b3-1818cd4ebde3

📥 Commits

Reviewing files that changed from the base of the PR and between 3dd74de and 421a68e.

📒 Files selected for processing (3)

• .coderabbit.yaml
• .github/dependabot.yml
• renovate.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/renovate-coderabbit

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