freeze_diagnose: fix max_opt_gap() returning 0 when OT stream silent; drop events entirely inside trimmed prefix; remove misclassified real_still/ (those were ep_005/017 OT-offline prefixes that shouldnt have appeared at all). Final: 41 events, all ot_loss.

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       "cam0_motion": 1.888,
@@ -856,6 +860,8 @@
       "side": "left",
       "a": 7926,
       "b": 7948,
+      "_h5_a": 7926,
+      "_h5_b": 7948,
       "length_s": 0.767,
       "view_motion": 3.097,
       "cam0_motion": 2.443,
@@ -869,44 +875,6 @@
       "ang_vel_near_rad_s": 306.111,
       "opt_gap_s": 0.7798,
       "verdict": "ot_loss"
-    },
-    {
-      "episode": "2026-05-11/episode_017",
-      "side": "left",
-      "a": 0,
-      "b": 19225,
-      "length_s": 640.867,
-      "view_motion": 2.618,
-      "cam0_motion": 2.196,
-      "cam1_motion": 2.61,
-      "tac_motion": 0.672,
-      "cam0_dup": 0.031,
-      "cam1_dup": 0.0,
-      "cam2_dup": 0.0,
-      "tac_dup": 0.781,
-      "trans_vel_near_mps": 0.395,
-      "ang_vel_near_rad_s": 1.538,
-      "opt_gap_s": 0.0121,
-      "verdict": "real_still"
-    },
-    {
-      "episode": "2026-05-11/episode_017",
-      "side": "right",
-      "a": 0,
-      "b": 19227,
-      "length_s": 640.933,
-      "view_motion": 2.623,
-      "cam0_motion": 2.149,
-      "cam1_motion": 2.614,
-      "tac_motion": 1.423,
-      "cam0_dup": 0.062,
-      "cam1_dup": 0.0,
-      "cam2_dup": 0.0,
-      "tac_dup": 0.531,
-      "trans_vel_near_mps": 0.042,
-      "ang_vel_near_rad_s": 0.856,
-      "opt_gap_s": 0.0121,
-      "verdict": "real_still"
     }
   ]
 }