brainstorming-herdrlisted

# Brainstorming (herdr overlay) **Precondition:** `HERDR_ENV=1`. If unset, use stock `superpowers:brainstorming`. Follow `superpowers:brainstorming` exactly, with ONE addition. **Before presenting the design for approval, ask whether it merits a second opinion.** Do not dispatch automatically. Ask the user a single question, e.g. "Want a codex second opinion on this design before you approve?" Only if they say yes, do the dispatch below. If they decline, go straight to the approval gate. If yes: 1. Write the design you are about to present to `<scratch>/brainstorm-review.context.md`, prefaced with: "You are a second reviewer. Critique this design for gaps, risks, and unstated assumptions. Be concise and specific." 2. Find your own pane id with `herdr pane list` (the focused pane) for `--from-pane`. **Pane reuse:** if you dispatched a second opinion earlier this session and that pane is still open, pass its pane id via `--reuse-pane` so this review runs in the same pane instead of opening another. Dispatch: ```bash shepherdr dispatch \ --role reviewer \ --context-file <scratch>/brainstorm-review.context.md \ --from-pane <your-pane> \ --task-id brainstorm-review \ --scratch <scratch> \ [--reuse-pane <prior-second-opinion-pane-id>] ``` 3. It prints JSON `{status, result_text, pane_id, ...}`. **Record `pane_id`** — that is the second-opinion pane to `--reuse-pane` next time. On `done`, fold `result_text` into what you present (agree → adjust the design; disagre