Visual Brainstorming Refactor: Browser Displays, Terminal Commands

Date: 2026-02-19 Status: Approved Scope: lib/brainstorm-server/, skills/brainstorming/visual-companion.md, tests/brainstorm-server/ During visual brainstorming, Claude runs wait-for-feedback.sh as a background task and blocks on TaskOutput(block=true, timeout=600s). This seizes the TUI entirely — the user cannot type to Claude while visual brainstorming is running.