A release lead wants to coordinate three specialist agents: one to inspect API compatibility, one to review migrations, and one to summarize release risk. The release lead starts from a trusted repository directory and uses GitHub CLI comments to preserve the handoff. Which option best describes the orchestration pattern?

The correct option is "Fan-out specialist reviews with delayed fan-in summary" because the prompt explicitly instructs the copilot to first produce two independent tasks ("API review task" and "migration review task") concurrently, which represents a fan-out. The prompt then states, "Do not produce the release summary until both reviews exist on the issue," indicating that the summary agent waits for both previous tasks to complete before starting, which is a delayed fan-in. "Single-agent implementation with automatic merge approval" is incorrect because the plan clearly involves three distinct specialist agents, not a single agent. "Matrix workflow validation without issue-level handoff" is incorrect because the GitHub CLI comments and issue-level instructions explicitly define the handoff mechanism and orchestration. "Human-only review replacing the agent workflow" is incorrect as the question describes an agent-based orchestration pattern, not a human-only process.