feat(runtime): sync experience bus and learner stack into main

docs/ops/payloads/phase4_1_payload_source_lock.json

@@ -0,0 +1,18 @@
+{
+  "update_id": 900002,
+  "message": {
+    "message_id": 1,
+    "date": 1760007001,
+    "chat": {
+      "id": 0,
+      "type": "private"
+    },
+    "from": {
+      "id": 0,
+      "is_bot": false,
+      "first_name": "Source",
+      "username": "lock_smoke"
+    },
+    "text": "source-lock-smoke"
+  }
+}