Produces a Porter strategic-group map overlaid with McKinsey Arenas framing for an industry. Identifies ≥3 strategic groups via 2-axis visualization, profiles each (size, members, basis of competition, profitability), names a winner archetype (consolidator / innovator-specialist / platform-orchestrator / vertically-integrated / asset-light / none-emerging), and assesses mobility barriers between adjacent groups. Output: competitive-arena.md with map, profiles, archetypes, mobility-barrier matrix, arenas overlay, V/C/A/I tags, next_skills YAML. Sub-skill of analyze-industry; standalone-invocable. Triggers on 'strategic group map for [industry]', 'competitive groups in [ind…
