Dual-agent review

Run two or more independent reviewers over the same diff, then reconcile their findings, fix the real ones, and report. Two reviewers that can't see each other catch different things and disagree on the false ones — so crossing them cuts both misses and false positives that a single reviewer ships. The calling (orchestrator) agent owns triage, fixes, and the final report.

Exact reviewer prompts, CodeRabbit CLI recipes, the parallel-fix prompt, and the report template live in reference/reviewer-prompts.md (load on demand).

Scope: the diff, by default