Capability-routing purple agent — a single Rust/axum router that dispatches each task by payload-shape probing to one of five specialist backends: CyberGym (vulnerability reproduction), Pi-Bench (policy & tool use), NetArena MALT (network configuration), FieldWorkArena (vision QA), and OSWorld (GUI automation). One agent across all five greens, spanning three-plus categories. Berkeley RDI AgentBeats Phase 2 Sprint 4.