feat: add global device queue and readiness tracking

tests/unit/admin_console/test_startup_progress.py

@@ -0,0 +1,51 @@
+from apps.admin_console.core.state import ServerState
+
+
+def test_startup_progress_is_ordered_and_upserted_by_stage():
+    state = ServerState()
+
+    state.record_startup_progress(
+        {
+            "session_id": "session-1",
+            "stage": "queued",
+            "message": "Task queued",
+            "timestamp": 1.0,
+        }
+    )
+    state.record_startup_progress(
+        {
+            "session_id": "session-1",
+            "stage": "device",
+            "message": "Checking device",
+            "timestamp": 2.0,
+        }
+    )
+    state.record_startup_progress(
+        {
+            "session_id": "session-1",
+            "stage": "device",
+            "message": "Device connected",
+            "timestamp": 3.0,
+        }
+    )
+
+    events = state.get_startup_progress("session-1")
+    assert [event["stage"] for event in events] == ["queued", "device"]
+    assert events[-1]["message"] == "Device connected"
+
+
+def test_startup_progress_snapshot_is_not_mutable_by_callers():
+    state = ServerState()
+    state.record_startup_progress(
+        {
+            "session_id": "session-1",
+            "stage": "queued",
+            "message": "Task queued",
+            "timestamp": 1.0,
+        }
+    )
+
+    snapshot = state.get_startup_progress("session-1")
+    snapshot[0]["message"] = "changed"
+
+    assert state.get_startup_progress("session-1")[0]["message"] == "Task queued"