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.html

@@ -74,6 +74,16 @@
             </span>
             <span class="item-time-divider" *ngIf="getDeviceSerial(session)">·</span>
             <span class="item-time">{{ session.start_time * 1000 | date:'shortTime' }}</span>
+            <button
+              *ngIf="getTaskStatus(session) === 'running' || getTaskStatus(session) === 'paused'"
+              type="button"
+              class="btn-stop-card" 
+              (click)="stopTask(session.session_id, $event)" 
+              title="Stop this task"
+              aria-label="Stop this task"
+            >
+              <span class="material-symbols-outlined">stop_circle</span>
+            </button>
             <button
               *ngIf="getTaskStatus(session) !== 'running' && getTaskStatus(session) !== 'paused'"
               type="button"