deploy(fc-chat): roll effective-prompt debug reveal v20260614-debugreveal-d389e4b

Influence Audit panel now surfaces the per-turn effective prompt
(RagContextSnapshot) as an operator/debug row. FlowerCore.Chat d389e4b.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/fc-chat/fc-chat.yaml

@@ -123,7 +123,7 @@ spec:
         fsGroupChangePolicy: OnRootMismatch
       containers:
         - name: chat-web
-          image: localhost/fc-chat-web:v20260614-bubblefix-37f57b0
+          image: localhost/fc-chat-web:v20260614-debugreveal-d389e4b
           imagePullPolicy: Never
           ports:
             - name: http