Upload processed/zhenglizhuomian (part 3)

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+    "frame_count": 1587,
+    "valid_rows": 1587,
+    "camera_poses": {},
+    "camera_pose_native": {
+      "head_left": {
+        "camera_frame": "",
+        "samples": 1625,
+        "valid_samples": 0,
+        "invalid_samples": 1625
+      },
+      "head_right": {
+        "camera_frame": "",
+        "samples": 1625,
+        "valid_samples": 0,
+        "invalid_samples": 1625
+      }
+    },
+    "valid_rows_with_camera_pose": 1587,
+    "first_valid_frame_with_camera_pose": 0,
+    "last_valid_frame_with_camera_pose": 1586,
+    "valid_segment_with_camera_pose_contiguous": true,
+    "first_valid_frame": 0,
+    "last_valid_frame": 1586,
+    "valid_segment_contiguous": true
+  },
+  "training_ready": true,
+  "camera_pose_required": false,
+  "camera_timing_limit": "Apex mosaic stamps are not per-camera exposures; holds are explicitly recorded",
+  "training_policy": "hq_v2_apex_mosaic",
+  "camera_backend": "apex"
+}