Assistant node, and the Control tab as one conversation (openpanel V5)

run_turn takes its tools, system prompt and tool caller; the chat passes the
MCP tools as before. The assistant node offers one tool per wired target,
reads its other inputs as context, streams its reply a sentence at a time,
warms the provider on `listening` and says so when the provider is not there.
Completions share the per-server HTTP client. wren replies when nothing reads
`unhandled`, stt shows a note when nothing was heard. /ai/control lists one
conversation per entry node with the messages to watch.

frontend/src/components/Chat/ChatPanel.tsx

@@ -34,9 +34,9 @@ export const aiStatusQueryOptions = () =>
   })
 
 /**
- * The wren nodes the Control tab can talk to. Under the flows prefix: the
- * socket invalidates it on every rebuild, so a node published anywhere shows
- * up without a reload.
+ * The conversations the Control tab can hold, one per wren or assistant node a
+ * command reaches first. Under the flows prefix: the socket invalidates it on
+ * every rebuild, so a node published anywhere shows up without a reload.
  */
 export const controlNodesQueryOptions = () =>
   queryOptions({
@@ -45,8 +45,8 @@ export const controlNodesQueryOptions = () =>
   })
 
 /**
- * What the panel is for: building flows with the assistant, or commanding a
- * wren node in one. A tab is there when there is something behind it, and the
+ * What the panel is for: building flows with the assistant, or commanding the
+ * wren and assistant nodes in one. A tab is there when there is something behind it, and the
  * strip only draws once there is a choice to make.
  */
 const TABS: readonly (readonly [ChatTab, string])[] = [
@@ -103,7 +103,7 @@ function fromTranscript(transcript: ChatItem[]): Item[] {
 }
 
 /**
- * The way into the Control tab from Home, there only while a wren node is.
+ * The way into the Control tab from Home, there only while a conversation is.
  * Shaped like the sidebar trigger, which it mirrors on a phone.
  */
 export function ControlTrigger({ className }: { className?: string }) {
@@ -371,7 +371,7 @@ export function ChatPanel() {
         {shown.length === 0 && !waiting ? (
           <p className="py-8 text-center text-sm text-muted-foreground">
             {controlling
-              ? "Type a command, like turn on the lights in the kitchen. What it did comes back here."
+              ? "Type a command, like turn on the kitchen light. What was said to the flow and what it did show up here."
               : "Describe a flow to build, a change to make, or ask what a failure means. Drafts land in the editor for you to publish."}
           </p>
         ) : null}
@@ -407,6 +407,18 @@ function Message({ item }: { item: Item }) {
           </Suspense>
         </div>
       )
+    case "heard":
+      return (
+        <div className="max-w-[85%] self-end whitespace-pre-wrap break-words rounded-lg bg-muted px-3 py-1.5 text-sm text-muted-foreground">
+          {item.text}
+        </div>
+      )
+    case "reply":
+      return (
+        <div className="min-w-0 max-w-full self-start whitespace-pre-wrap break-words px-1 text-sm">
+          {item.text}
+        </div>
+      )
     case "error":
       return <div className="px-1 text-xs text-destructive">{item.text}</div>
     case "actions":
@@ -431,7 +443,7 @@ function Message({ item }: { item: Item }) {
   }
 }
 
-/** A wren node's answer: each call, where it went, and whether it was applied. */
+/** What a node set: each call, where it went, and whether it was applied. */
 function Actions({ actions }: { actions: Action[] }) {
   if (actions.length === 0) {
     return (
@@ -462,9 +474,11 @@ function Actions({ actions }: { actions: Action[] }) {
               : " (nothing wired for it)"}
         </div>
       ))}
-      <div className="text-muted-foreground">
-        confidence {actions[0].confidence.toFixed(2)}
-      </div>
+      {typeof actions[0].confidence === "number" ? (
+        <div className="text-muted-foreground">
+          confidence {actions[0].confidence.toFixed(2)}
+        </div>
+      ) : null}
     </div>
   )
 }