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

artemis/runtime/device_pool.py

@@ -223,6 +223,16 @@ class DevicePool:
             # If not detected by ADB, still return it so ADB can attempt connection
             return preferred_serial
 
+        # Prefer active ready device from readiness engine if available
+        try:
+            from artemis.core.diagnostics import readiness_engine
+
+            active_serial = readiness_engine.get_active_device_serial()
+            if active_serial and any(d.serial == active_serial and d.state == "device" for d in all_devs):
+                return active_serial
+        except Exception:
+            pass
+
         # Pick first idle device
         for dev in ready_devs:
             if not dev.is_busy: