.@kplikethebird on building an AI writing plugin that improves over time. Katie doesn't write in a chat window anymore. Instead of starting fresh in a Claude or ChatGPT project, every piece she writes runs through a system she built in the Claude desktop app—that already knows her voice, her style, and how she wants a draft to come together. That system is Compound Writing. In February, she downloaded @kieranklaassen's Compound Engineering plugin and asked Claude to help her build the same…