fix: prevent bot ping-pong in implicit continuation window

Exclude is_bot_message from implicit continuation trigger check.
Previously, bot A's response would trigger bot B's continuation
window, causing infinite back-and-forth responses.

Also: tool activity sub-lines use description over summary,
and max activities reduced to 2.

src/message-runtime-rules.ts

@@ -44,7 +44,9 @@ export function createImplicitContinuationTracker(idleTimeout: number) {
         implicitContinuationUntil.delete(chatJid);
         return false;
       }
-      return messages.some((message) => message.is_from_me !== true);
+      return messages.some(
+        (message) => message.is_from_me !== true && !message.is_bot_message,
+      );
     },
   };
 }