legion-codex-mode

The Codex-CLI-primary routing brain for Legion — the mirror of legion-router. When you run Legion under Codex you (GPT-5.5) do most of the work; this skill tells you WHEN to hand a task up to Claude via `legion-claude` (deep architecture, polished/complex frontend with the impeccable skill, final cross-model review, tie-breaks, when stuck) versus inline — with automatic GPT-5.5 fallback if the Claude limit is hit. Also maps what runs natively on Codex (MCPs, mirrored skills, bridged commands/agents) so you don't reach for Claude needlessly. Triggers on running Legion under Codex, deep-design/frontend-polish/final-review smells, or 'ask claude' / 'second opinion from claude'.