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/pages/home/home.component.html

@@ -1375,6 +1375,31 @@
                     <span>{{ isRefreshingDiagnostics() ? 'Checking...' : 'Check Again' }}</span>
                   </button>
                 </div>
+
+                <!-- Multi-Device Switcher if multiple devices detected -->
+                @if (connectedDevices().length > 1) {
+                  <div class="multi-device-switcher" style="margin-top: 12px;">
+                    <span class="switcher-label">Select Active Device:</span>
+                    <div class="switcher-chips">
+                      @for (dev of connectedDevices(); track dev.serial) {
+                        <button
+                          type="button"
+                          class="device-chip-btn"
+                          [class.selected]="dev.serial === activeDevice()?.serial"
+                          (click)="selectTargetDevice(dev.serial)"
+                        >
+                          <span class="material-symbols-outlined chip-icon">
+                            phone_android
+                          </span>
+                          <span>{{ dev.model || dev.serial }}</span>
+                          @if (dev.serial === activeDevice()?.serial) {
+                            <span class="active-check">✓ Active</span>
+                          }
+                        </button>
+                      }
+                    </div>
+                  </div>
+                }
               </div>
             }