fix(rectification): keep one delivery and adopt with the birth date

Accept and GET now decide with the same birth snapshot as the answer, so an under-age probe cannot flip can_adopt. The exit skips a second write when this reply already delivered. The card stays without an adopt button when adoption is not allowed, and a refusal shows the Chinese sentence.

frontend/DESIGN.md

@@ -381,7 +381,7 @@ The birth-time rectification session is the consultation transcript plus a house
 | `verified_idle` | one closing line `postAdoptVerifyDone` under the still-visible range card (same assistant column); no spinner, no reload | enabled |
 | `typed-pending` | the live row reads “收到，正在对照你的档案…” from the frame the answer is sent, then follows `turn.progress`: “正在记下这件事…” → “正在重新对照盘面…” → “正在准备下一个问题…” (BUG-1047). A running tool step shows the same stage line; finished steps keep their done labels. None of it survives the settle | enabled (typing queues), stop visible |
 | `choice-pending` | the answered card (`data-selected` fill, a top row “正在记录…”) and the same live row from “正在记录本次选择…” through the follow-up turn | enabled (typing queues), stop visible |
-| `candidates` | one range-delivery card titled “目前范围 …（对照了 N 件经历）”, a caption under the title. A subtitle “最可能 HH:MM” (the representative minute) sits under the title (D3, 2026-09-26), only when the percentages are shown (first column ≥ 5 points ahead). The card appears once the refresh, the skip retry and the seven targeted kinds have been asked, or the reader said there is nothing more to add. Guided boundary windows are asked when they come up (at most two per Case, D1 2026-09-26) but an unasked window no longer holds the card (D2 2026-09-26). The precision gate (range ≤ 10 minutes, top-two gap > 3 points, no exact tie) is reported as `precision_gate_met` but never gates the card on its own: meeting it skips no remaining line, and failing it adds no marker to the card once there is nothing left to ask. No free-text invite. Optional “再答两道参考题微调排序” only when unused D9/D10 remain; if those were already asked and the top two are still within one point, a line “这两分钟按现有信息分不开，参考题已经用过.”; then up to three compare columns (highest posterior first; “更像这个” adopts); a closed “查看验证报告” fold. On a normal convergence, unused style questions are asked before this card. Exhausted and closed-ceiling exits still deliver the card if a style question cannot be rendered, once the precision gate or the “nothing more” stop is met. | enabled |
+| `candidates` | one range-delivery card titled “目前范围 …（对照了 N 件经历）”, a caption under the title. A subtitle “最可能 HH:MM” (the representative minute) sits under the title (D3, 2026-09-26), only when the percentages are shown (first column ≥ 5 points ahead). The card appears once the refresh, the skip retry and the seven targeted kinds have been asked, or the reader said there is nothing more to add. Guided boundary windows are asked when they come up (at most two per Case, D1 2026-09-26) but an unasked window no longer holds the card (D2 2026-09-26). The precision gate (range ≤ 10 minutes, top-two gap > 3 points, no exact tie) is reported as `precision_gate_met` but never gates the card on its own: meeting it skips no remaining line, and failing it adds no marker to the card once there is nothing left to ask. No free-text invite. Optional “再答两道参考题微调排序” only when unused D9/D10 remain; if those were already asked and the top two are still within one point, a line “这两分钟按现有信息分不开，参考题已经用过.”; then up to three compare columns (highest posterior first; “更像这个” adopts); a closed “查看验证报告” fold. On a normal convergence, unused style questions are asked before this card. Exhausted and closed-ceiling exits still deliver the card if a style question cannot be rendered, once the precision gate or the “nothing more” stop is met. When the result is a delivery outcome but adoption is not allowed (`can_adopt` false, or the outcome is outside the adopt set, such as `completed_with_range`), the card stays and has no adopt button and no “采用后按…排盘” line. The button appears only for an adopt outcome with `can_adopt` true. After adoption the card stays and shows “已采用”. | enabled |
 | `guided-collect` | a named yes/no card then an entry card. A window whose boundary track carries a domain (D9 / D10 Narayana) asks “YYYY 年 M 到 M 月之间，有没有<那一类事>？”; every other window asks openly — “YYYY 年 M 到 M 月之间，有没有什么事，比如<two or three still-open kinds>？” — and one window is asked once, whatever label it carries. The entry card is seven type chips (an open window defaults to the first still-open kind) plus a month-granularity date picker (day optional, years from birth year to this year); submitting writes “YYYY 年 M 月（D 日），<领域标签>方面有一件事”, never the question’s example list. Composer stays enabled. | enabled (typing still records), stop visible |
 | `adopting` | “正在采用 HH:MM…” until the adopt message arrives (server-written with the first post-adopt check, BUG-1146; idempotent accept still runs the follow-up turn) | enabled (typing queues), stop visible |
 | `confirmed` | “已确认校正时间：HH:MM” | enabled |