What does "Find the tension" do in the Codex?

From version 1.9.22, "Find the tension" (in the Codex, under Relations) looks at your characters and their relationships with an editor's eye. It tells you which relationships look flat or unused, and suggests ideas to make them more gripping, each with the chapter where it would fit. "Keep as a thread" turns an idea into an open thread, which the AI then builds toward as it writes; "Other ideas" asks again. It reads the relationships as they are saved, so press Save first if you changed anything.