vtemian/octto — reverse-engineered prompt

Build me an OpenCode plugin called octto that turns AI brainstorming into a browser based clicking experience instead of a long terminal chat.

When I pick the octto agent and type an idea, it should open a local browser window with question cards. I want to answer in any order, see new follow up questions appear right away, track progress, and review a final visual plan before approving it. The tool should split my request into 2 to 4 exploration branches, ask only the questions it still needs, then save the finished plan into docs/plans.

Please include useful input styles like radio choices, checkboxes, yes or no buttons, sliders, rankings, star ratings, thumbs up or down, option cards with pros and cons, code diffs, text and code boxes, file or image upload, and emoji reactions.

Also add simple config for the local port, agent model overrides, custom prompt fragments, and an environment variable for the port. Use TypeScript, add tests, and look up current OpenCode plugin docs if needed.