v0 rebuilt: padded lines collapsed, think steps hidden, strict prefix filter

dev.jsonl

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:d4b8ae9111192fae7685a9ad95611fd173e628ec713ebf46fda8b0c1756c22c5
-size 112807187
+oid sha256:bc4e3a958c65f738118370f58f67fd3355f704ba4d913290cf8f3564e17a62c1
+size 103348043

stats.json

@@ -5,43 +5,54 @@
  "seed": 0,
  "files": {
   "train": {
-   "records": 50002,
+   "records": 49987,
    "per_dataset": {
     "SWE-rebench-openhands-trajectories": 25002,
-    "SWE-agent-trajectories": 25000
+    "SWE-agent-trajectories": 24985
    },
-   "positive_rate": 0.3252,
+   "positive_rate": 0.3253,
    "state_tokens_p50_p90": [
-    2802,
+    2829,
     4068
    ],
-   "state_tokens_total": 133765093
+   "state_tokens_total": 134244622,
+   "dropped": {
+    "last_action_is_finish": 11,
+    "prefix_is_full_run": 4
+   }
   },
   "dev": {
-   "records": 10001,
+   "records": 9999,
    "per_dataset": {
     "SWE-rebench-openhands-trajectories": 5000,
-    "SWE-agent-trajectories": 5001
+    "SWE-agent-trajectories": 4999
    },
    "positive_rate": 0.2916,
    "state_tokens_p50_p90": [
-    2998,
+    3023,
     4072
    ],
-   "state_tokens_total": 28475821
+   "state_tokens_total": 28576745,
+   "dropped": {
+    "prefix_is_full_run": 2
+   }
   },
   "test": {
-   "records": 64136,
+   "records": 64124,
    "per_dataset": {
-    "SWE-agent-trajectories": 33242,
+    "SWE-agent-trajectories": 33230,
     "SWE-rebench-openhands-trajectories": 30894
    },
-   "positive_rate": 0.3546,
+   "positive_rate": 0.3547,
    "state_tokens_p50_p90": [
-    2752,
+    2777,
     4065
    ],
-   "state_tokens_total": 169039506
+   "state_tokens_total": 169732466,
+   "dropped": {
+    "prefix_is_full_run": 11,
+    "last_action_is_finish": 1
+   }
   }
  }
 }

test.jsonl

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:41c04f0ac793d1363c0630cf422d5e4971dac1151d110baf8f3e9d7586406430
-size 695274359
+oid sha256:f57fee6841ea434a73053dbfa1cf6f55f859b691075f6b6908d29904a6019098
+size 629913163

train.jsonl

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:a4f76b5dca4985e6a540add8d42879375b8a1b794bf6a3086552c7c8fdd56c21
-size 543810721
+oid sha256:97c80525df2b21a96ce2c41e596e9d143bce5ac21b8601337256971f86f9be3f
+size 493093454