feat: enhance daemon dispatching, device readiness fallback, and live streaming UI

- Admin Console & Task Queue: add cancellation, session startup progress endpoints, and support ingress metadata
- Diagnostics & Runtime: enhance ADB probe to prefer unlocked devices and synchronize with readiness engine
- MCP Server: dispatch tasks through Artemis Daemon scheduler with fallback to standalone runner, improve action overlays
- Showcase UI: improve session auto-selection with pinning support, render startup progress, and refine stream styling
- CLI & Makefile: expose server lifecycle commands (restart, stop, status)
- Configuration: ignore runtime server state file in .gitignore

apps/showcase_ui/src/app/components/agent-stream/agent-stream.component.ts

@@ -643,6 +643,11 @@ export class AgentStreamComponent implements AfterViewInit {
     this.isTaskDropdownOpen.set(false);
   }
 
+  public stopTask(sessionId: string, event?: Event): void {
+    if (event) event.stopPropagation();
+    this.agentService.stopTask(sessionId, false);
+  }
+
   public deleteTask(sessionId: string, event?: Event): void {
     if (event) event.stopPropagation();
     if (!confirm(`Are you sure you want to delete this task? This cannot be undone.`)) {