Remove noisy agent toasts and debug logging

Remove the "Refreshing" and "Failed to refresh agent" toasts from the
agent panel — they fire frequently but are meaningless since sync
recovers transparently. The "Reconnecting..." toast for host disconnect
is preserved.

Strip debug console.log calls across the app: render tracking in
message/stream views, dependency change tracking in workspace screen,
terminal tab slot logging, and verbose audio engine/voice runtime
bridge stats logging. Legitimate console.error/warn in catch blocks
are kept.

packages/app/src/components/split-container.tsx

@@ -177,18 +177,6 @@ const MountedTabSlot = memo(function MountedTabSlot({
   paneId,
   buildPaneContentModel,
 }: MountedTabSlotProps) {
-  useEffect(() => {
-    if (tabDescriptor.target.kind !== "terminal") {
-      return;
-    }
-    console.log("[terminal-tab-slot]", {
-      paneId,
-      tabId: tabDescriptor.tabId,
-      terminalId: tabDescriptor.target.terminalId,
-      isVisible,
-      isPaneFocused,
-    });
-  }, [isPaneFocused, isVisible, paneId, tabDescriptor]);
 
   const content = useMemo(
     () =>