feat: convert AM516 lead times to workdays

capabilities/am516-delivery-prediction/skills/joint-module-leadtime-report/SKILL.md

@@ -44,8 +44,12 @@ Stop if:
 
 - Enter the query workflow only when one message contains exactly one complete,
   rule-valid eRob model and exactly one positive quantity.
+- After a valid initial query or valid same-conversation candidate continuation
+  passes this gate, immediately reply with `👀` before starting the API query so
+  the sender knows the request was received.
 - If the model or quantity is missing, invalid, multiple, or ambiguous, stay
-  silent: send no Feishu reply, make no API request, and append no record.
+  silent: send no acknowledgement or other Feishu reply, make no API request,
+  and append no record.
 - An @mention by itself does not bypass this content gate.
 - After a valid message passes the gate, API or runtime failures may still return
   the bounded internal error response defined by this capability.
@@ -89,9 +93,12 @@ Do not use temporary curl, WebFetch, or any API method outside the controlled sc
 
 ## Output Selection
 
-- Prefer `data.交期汇总.AM516预测交期` when the API returns it and AR51 confirms it is usable.
-- If AM516 fields are absent, use original API prediction and mark it as original algorithm reference.
-- If only total days are available, state the total days and ask for human review.
+- Prefer numeric `data.交期汇总.AM516总交期`; if it is absent, fall back to numeric `data.交期汇总.总交期`. Treat this value as the original natural-day lead time `N`.
+- Convert `N` with `(q, r) = divmod(N, 7)`: `r = 0` gives `q × 5`; `1 ≤ r ≤ 4` gives `q × 5 + MAX(r - 1, 0)`; `5 ≤ r ≤ 6` gives `q × 5 + r - 2`. The result is workday lead time `W`.
+- Starting from the local query date, exclude the query date itself and count forward `W` workdays using the configured China statutory calendar. Statutory holidays are not workdays, ordinary Saturdays and Sundays are not workdays, and official makeup Saturdays or Sundays are workdays.
+- The configured 2026 calendar follows `国办发明电〔2025〕7号`. If counting reaches a year whose official calendar is not configured, do not silently estimate a delivery date; mark that calendar year as pending.
+- Display the calculated delivery date together with both `N` and `W`, for example `2026-10-09（原始31个自然日，折算22个工作日）`.
+- Use `data.交期汇总.AM516预测交期` only as a fallback when the API does not return a usable whole-number natural-day lead time, and explicitly mark that no conversion was performed.
 
 ## Candidate Batch Rule
 
@@ -156,13 +163,13 @@ Use this field order for a successful Feishu report:
 总体判断：
 - 现货候选：{fully covered candidate or none}
 - 最快候选型号：{fastest candidate}
-- 最快候选交期：{predicted date and total days}
+- 最快候选交期：{calculated delivery date, original natural days, and converted workdays}
 - 是否完全覆盖数量：{yes / no / unavailable}
 - 主导因素：{main factor}
 
 1. {model}（{candidate type and reducer brand}）
 - 数量：{quantity}台
-- AM516预测交期：{date and total days}
+- AM516预测交期：{calculated delivery date}（原始{N}个自然日，折算{W}个工作日）
 - 可用库存/覆盖情况：{summary-level inventory and coverage only}
 - 主导因素：{main factor}
 - 推荐理由：{rule-based recommendation reason}