IPv6 1 story

The role of IPv6 within Network Standards & Protocols is specific enough to warrant focused coverage rather than being folded into the parent category. Coverage uses IPv6 architecture, IPv6 protocol, IPv6 configuration, and IPv6 compatibility to explain how the layer works, what it depends on, and where compatibility or configuration matters. This keeps IPv6 narrower than Network Standards & Protocols as a whole while giving readers enough context to compare approaches, understand expected behavior, and recognize when a problem-specific tag is the better fit.