chore: add .coderabbit.yaml with request_changes_workflow

[samuelho-dev]

Summary

• Adds .coderabbit.yaml with reviews.request_changes_workflow: true so CodeRabbit posts a formal Approve / Request-Changes PR review (not just a walkthrough comment). This lets reviewDecision reflect CodeRabbit's verdict and lets branch-protection "Require approvals" use it as a real merge gate.
• Pre-merge checks (title/description/docstrings) start in warning mode — non-blocking until we tune thresholds, then flip to error per-check.
• auto_review.base_branches: [main] keeps reviews scoped to PRs targeting main.

Why

PR #24 surfaced that CodeRabbit was running but its result wasn't blocking merge — the pending Commit Status cleared during force-push and the merge happened before the re-review landed. With request_changes_workflow: true and "Require approvals" in branch protection, CodeRabbit's verdict becomes load-bearing.

Test plan

• YAML validates (no merge conflicts, no unknown keys per https://docs.coderabbit.ai/reference/configuration)
• On this PR, CodeRabbit should post a formal review (visible in gh pr view --json reviews) once review completes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 73a8682d-52c2-4aab-8a66-4f6c014582a5

📥 Commits

Reviewing files that changed from the base of the PR and between bf7d87c and 96a9c1e.

📒 Files selected for processing (1)

• .coderabbit.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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