fix(examples): drop redundant <chat-subagents> sidebar tray in canonical demo (#722)

After #711 the <chat> composition renders each subagent inline as a persistent
chat-subagent-card, so the demo-shell's separate active-only <chat-subagents>
sidebar tray double-displayed subagents during a run. Remove it (mount, import,
orphaned CSS) to match #718's fix for cockpit/chat/subagents. Also refresh a
stale comment in cockpit/ag-ui/subagents.

Author: blove

cockpit/ag-ui/subagents/angular/src/app/subagents.component.ts

@@ -12,8 +12,8 @@ import { ExampleChatLayoutComponent } from '@threadplane/example-layouts';
  * subagent-specific wiring is needed in the component: when the orchestrator
  * dispatches a `task` tool call, the backend converts the subagent_activity
  * CUSTOM events into native AG-UI ACTIVITY events, the @threadplane/ag-ui
- * reducer projects them onto `agent.subagents()`, and <chat> renders a
- * <chat-subagents> live card for each running subagent.
+ * reducer projects them onto `agent.subagents()`, and <chat> renders each
+ * dispatch inline as a persistent `chat-subagent-card`.
  *
  * Demonstrates the chat-runtime decoupling: same <chat> composition as the
  * LangGraph cockpit, AG-UI runtime instead of LangGraph.

examples/chat/angular/src/app/shell/demo-shell.component.css

@@ -143,18 +143,6 @@
   border-radius: var(--ngaf-chat-radius-card, 10px);
 }
 
-.demo-shell__subagents {
-  position: fixed;
-  left: 50%;
-  bottom: 96px;
-  transform: translateX(-50%);
-  z-index: 997;
-  width: min(640px, calc(100vw - 32px));
-  display: flex;
-  flex-direction: column;
-  gap: 8px;
-}
-
 .demo-shell__theme-toggle {
   width: 28px;
   height: 28px;

examples/chat/angular/src/app/shell/demo-shell.component.html

@@ -119,11 +119,6 @@
         <chat-interrupt-panel [agent]="agent" (action)="onInterruptAction($event)" />
       </div>
     }
-    @if (agent.subagents && agent.subagents().size > 0) {
-      <div class="demo-shell__subagents" role="region" aria-label="Active subagents">
-        <chat-subagents [agent]="agent" />
-      </div>
-    }
   </div>
 
   <chat-history-search-palette

examples/chat/angular/src/app/shell/demo-shell.component.ts

@@ -18,7 +18,6 @@ import { DEMO_AGENT_REF, type DemoState } from './agent-ref';
 import { ThreadplaneTelemetryService } from '@threadplane/telemetry/browser';
 import {
   ChatInterruptPanelComponent,
-  ChatSubagentsComponent,
   ChatSidenavComponent,
   ChatSidenavScrimComponent,
   ChatHistorySearchPaletteComponent,
@@ -72,7 +71,6 @@ function parseUrl(url: string): { mode: DemoMode; threadId: string | null } {
   imports: [
     RouterOutlet,
     ChatInterruptPanelComponent,
-    ChatSubagentsComponent,
     ChatSidenavComponent,
     ChatSidenavScrimComponent,
     ChatHistorySearchPaletteComponent,