fix(rectification): stop speaking unstampable distinguish stems (BUG-674/675)

Distinguish followups that cannot stamp a probe now go to persistExhaustionCollect instead of repeating the card stem in the assistant body. Choice focuses without asked_turn_id hang on the last assistant turn, and persisted_question with a live choice_card renders the existing card. Representative-time inconsistency is warn-only (BUG-676 investigating).

docs/tasks/README.md

@@ -184,7 +184,7 @@
 
 | `TASK-rectification-targeted-card-dead-20260913.md` | `PROGRESS-rectification-targeted-card-dead-20260913.md` | **P0**：定向补事卡在快照投影里拿不到 `choice_card`（承接焦点分支不重建 `choice_frame`），卡片看得见点不动、流程停在采集等待态；模型还会把定向题改写成口述题（BUG-669～671）。先于 tie-break 修复单执行 | 待验收 | `codex/rectification-targeted-card-dead-20260913` |
 
-| `TASK-rectification-unstampable-probe-and-naked-card-20260914.md` | `PROGRESS-rectification-unstampable-probe-20260914.md` | **P0**：探针池空后判别题盖不上 probe → 焦点写不进 → 题干被念进正文、同一题反复问且答了不算数（BUG-674，推翻前一单 D3）；快照已有 `choice_card` 但 `persisted_question` 仍只画一行裸题（BUG-675）；同一轮 receipt 里 `representative_time` 取到 `eliminated_ids` 里的候选（BUG-676，investigating） | 待执行 | `codex/rectification-unstampable-probe-20260914` |
+| `TASK-rectification-unstampable-probe-and-naked-card-20260914.md` | `PROGRESS-rectification-unstampable-probe-20260914.md` | **P0**：探针池空后判别题盖不上 probe → 焦点写不进 → 题干被念进正文、同一题反复问且答了不算数（BUG-674，推翻前一单 D3）；快照已有 `choice_card` 但 `persisted_question` 仍只画一行裸题（BUG-675）；同一轮 receipt 里 `representative_time` 取到 `eliminated_ids` 里的候选（BUG-676，investigating） | 待验收 | `codex/rectification-unstampable-probe-20260914` |
 
 | `TASK-rectification-targeted-collect-spoken-focus-20260913.md` | `PROGRESS-rectification-targeted-collect-spoken-focus-20260913.md` | **P0**：定向补事题以采集型 schema 存进焦点，前端只能裸画一行题干（无头像无卡无修复入口），本轮计划的 D9 题被静默吞掉；BUG-670 的识别条件只认 `targeted_collect` 章，复原不了（BUG-673，复发自 BUG-670） | 待验收 | `codex/rectification-targeted-collect-spoken-focus-20260913` |