deploy(fc-chat): roll mood-signal build v20260614-moodsignal-a606892

Workstream A: set_mood structured signal replaces leaky [mood:X] text
(FlowerCore.Chat a606892). Image built + imported to rke2-server and
rke2-agent1.

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-wave5-sentiment-685f62c
+          image: localhost/fc-chat-web:v20260614-moodsignal-a606892
           imagePullPolicy: Never
           ports:
             - name: http