pikuri-subagents owns the sub-agent (delegation) feature top to bottom: the +Pikuri::SubAgent::SubAgentTool+ class (exposed to the LLM as the +agent+ tool), the +Persona+ record, the +Extension+ that wires it onto an agent, and the bundled +Pikuri::SubAgent::RESEARCHER+ persona (network-read only). Hosts that want sub-agents add this gem as a runtime dep and call +c.add_extension Pikuri::SubAgent::Extension.new(personas: [...])+ inside their +Agent.new+ block — same opt-in shape as +pikuri-skills+ / +pikuri-mcp+. Also ships +bin/pikuri-minions+ as a fan-out delegation demo.