Contributors frequently fork the repo and accidentally include their local .beads/issues.jsonl changes in PRs. This adds: 1. A new CI job that fails PRs containing .beads/issues.jsonl changes 2. Clear error message with fix instructions 3. Updated CONTRIBUTING.md with guidance This should prevent the common issue of PRs including unintended database changes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>