alibaba/nacos Adds A2A Agent Registry — Legacy Service Mesh Infrastructure Goes Agent-Native

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Alibaba's Nacos service discovery platform (32.7K stars) now lists A2A registry and AI agent registry as first-class features, positioning existing service mesh infrastructure as the discovery layer for agent-to-agent communication. Nacos is already deployed across thousands of production Java/Spring Boot environments, making it the lowest-friction path to agent discovery for enterprises already in the Alibaba ecosystem. The pattern of retrofitting existing service registries as agent directories is an architectural shift distinct from purpose-built agent platforms.