fix: use message reaction for query acknowledgement

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

@@ -45,10 +45,10 @@ 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.
+  passes this gate, immediately add the Feishu `OnIt` (typing) reaction to the
+  original message before starting the API query so the sender knows it was received.
 - If the model or quantity is missing, invalid, multiple, or ambiguous, stay
-  silent: send no acknowledgement or other Feishu reply, make no API request,
+  silent: add no reaction, send no 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