Add passing causal training correctness checks

verification/preflight.json

@@ -0,0 +1,14 @@
+{
+  "passed": true,
+  "trainer_sha256": "d5ef19a4cc0a6a26137865553e46a707882dae111ddd52832bd826f052dc0d09",
+  "request_revision": 0,
+  "artifact_sha256": null,
+  "checks": {
+    "target_alignment": true,
+    "causality": true,
+    "finite_loss_gradients": true,
+    "active_memory": true,
+    "checkpoint_reload": true
+  },
+  "checkpoint_meta": {}
+}