Run /ultrareview before any critical merge

Before shipping anything load-bearing, run `/ultrareview` in Claude Code. It's slower and more thorough than `/review` — designed for the pre-merge moment specifically. Catches the kind of subtle bugs a careful human reviewer would (bad edge cases, missing null checks, silent state leaks). Takes about 30s more than a regular review. Pays for itself the first time it catches something that would've shipped.