[feature] stage-bundles P1-4: suggested questions — click a ghost row to generate how to ask it in the next meeting

[Lanznx]

Stage-bundles P1-4 of 4. Design: docs/design/stage-bundles.md (PR #144) §5, S4. Tracked under #137, depends on P1-3.

Scope

• Clicking a ghost row or the cell header's "how to ask" → generate 2–3 suggested questions on the spot (P1 is the out-of-meeting form: "how to open the next meeting"; the input does not include the transcript tail)
• Input: the slot hint + the claims already in that slot (so we don't ask about what we already know) + how the attendees are addressed (the buying committee)
• Output reuses the SolutionReply shape (reply = a zh-TW business question you can read aloud verbatim; consideration = a one-liner on what the question is fishing for; kind reuses the wargame categories, or add a probe kind)
• Hard rules on phrasing, written into the prompt: build on what's already known, prefer open-ended, one question at a time, don't sound like a survey. A canned question ("So what's your budget?") is a failure case — include good and bad examples in the prompt
• UI reuses the FindingSolution card styling and lazy cache (per slot × hash of that slot's claims)

Acceptance

• Test against the AI3 / Sheraton claim libraries: would you actually dare read the generated question out loud? (Brandon's subjective sign-off, design §9 metric)
• Reopening the same slot doesn't re-hit the AI (cache); degrade gracefully when no provider key is configured (hide the entry point)

Depends on P1-3. The live form (picking up from the transcript tail) is P2.

[Lanznx]

建議問法的 few-shot 素材已備：I 鏈三件套（頻率/單價/總額）、「沒統計過」的接法、二選一約時間、「你被交代找哪一類方案」、五桶問題庫——原文在私有 Drive playbook（見 design doc 附錄 B），寫 prompt 時引用需去識別化＋改寫成行業中性。另注意 demo 場語感例外：只問封閉、已知八成答案的題（doc §5 已更新）。