hex-review

Tiered adversarial review orchestrator for a working tree, branch diff, pull request, or plan/markdown artifact before it lands on main — a staged reviewer panel (spec, quality, security, performance, docs), root-cause analysis, and an optional cross-model adversarial gate scale with diff size via tier (low|medium|high|xhigh|max, auto by default). Use for pre-merge checks, code review, branch or PR review, diff…