Add strict chronological split manifest

manifests/chronological_split_2025.json

@@ -0,0 +1,40 @@
+{
+  "format": "ASR_CYGNSS_CHRONOLOGICAL_SPLIT_2025_V2",
+  "created_utc": "2026-08-02T05:30:51.457767+00:00",
+  "total_rows": 10688077,
+  "anchor_fraction_requested": 0.05,
+  "anchor_rows": 534404,
+  "test_rows": 10153673,
+  "cutoff_time_sec_since_2015": 317147277.249261,
+  "cutoff_time_utc": "2025-01-18T16:27:57.249261022+00:00",
+  "anchor_rows_by_file": {
+    "predictions/raw_2025/month=01/part-000.parquet": 534404,
+    "predictions/raw_2025/month=02/part-000.parquet": 0,
+    "predictions/raw_2025/month=03/part-000.parquet": 0,
+    "predictions/raw_2025/month=04/part-000.parquet": 0,
+    "predictions/raw_2025/month=05/part-000.parquet": 0,
+    "predictions/raw_2025/month=06/part-000.parquet": 0,
+    "predictions/raw_2025/month=07/part-000.parquet": 0,
+    "predictions/raw_2025/month=08/part-000.parquet": 0,
+    "predictions/raw_2025/month=09/part-000.parquet": 0,
+    "predictions/raw_2025/month=10/part-000.parquet": 0,
+    "predictions/raw_2025/month=11/part-000.parquet": 0,
+    "predictions/raw_2025/month=12/part-000.parquet": 0
+  },
+  "files": [
+    "predictions/raw_2025/month=01/part-000.parquet",
+    "predictions/raw_2025/month=02/part-000.parquet",
+    "predictions/raw_2025/month=03/part-000.parquet",
+    "predictions/raw_2025/month=04/part-000.parquet",
+    "predictions/raw_2025/month=05/part-000.parquet",
+    "predictions/raw_2025/month=06/part-000.parquet",
+    "predictions/raw_2025/month=07/part-000.parquet",
+    "predictions/raw_2025/month=08/part-000.parquet",
+    "predictions/raw_2025/month=09/part-000.parquet",
+    "predictions/raw_2025/month=10/part-000.parquet",
+    "predictions/raw_2025/month=11/part-000.parquet",
+    "predictions/raw_2025/month=12/part-000.parquet"
+  ],
+  "anchor_test_overlap": 0,
+  "calibrator_sha256": "91a8cbc728997476613249d3122a9ee0a79d529f0aeec78af6c76b71b9a0282d"
+}