Automated PR code review with nex-pro

A GitHub Actions workflow that runs nex-pro on every PR diff, comments inline review notes, and gates merging if critical issues are found. ~$0.02 per medium-size PR.

Outline

• Setting up nex-pro as a GitHub Actions secret
• Parsing the unified diff into per-file chunks small enough for 32K context
• Prompt template: "you are a senior engineer reviewing this diff — output JSON with issues, severity, line numbers"
• Posting review comments via the GitHub REST API (one comment per issue, on the right line)
• Severity gating: fail the check if any "critical" issue is detected
• Cost tracking: log per-PR spend to a CSV; alert on outliers
• Limitations: not great at full-architecture review (needs the whole repo), good at: dead code, missing error handling, obvious security bugs, style consistency

Ship-date guess

Sprint 2, week 4 (within the next two weeks).