Hero: sessions form a team with groups, state, memory — not just messaging. Features: 4 tabs with real CLI code (groups, state, memory, coordination patterns). Use cases: team sprint with 5 agents, new-hire knowledge transfer via recall(), deploy-frozen via shared state. All match the shipped spec (v0.3.0). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>