openclaw - 💡(How to fix) Fix pr-release: scan repositories and classify PR readiness

What to build

Add the scan engine that classifies configured or command-provided repositories into ready, already has PR, branch error, locked, no changes, or GitHub permission error using remote branches only.

Acceptance criteria

• Scan uses configured enabled repos by default and command-provided repos when supplied.
• Unconfigured command-provided repos require confirmation and are marked ad_hoc after confirmation.
• Source and target branches are validated remotely; missing branches are reported per repo without blocking valid repos.
• Existing open/draft PRs from source to target are detected and grouped separately.
• A repo is ready only when source is ahead of target.
• Locked repos are reported with the owning workflow id.
• Tests mock GitHub CLI/API responses for each classification group.

Blocked by

• pr-release: persist workflow state, repo locks, idempotency, and audit events