Generates research ideas for a defined research problem. Reads the project's literature and context, explores directions with research ideation lenses, writes three full candidate proposals, and selects one through an explicit gate. Writes Ideation/ideas/selected_idea.txt for inno-idea-eval. Use when the user wants research ideas, hypotheses, a research direction, or a method idea for a paper or project. Runs after literature survey and before inno-idea-eval.