guard: persist sort/sdp best HOTA=57.675 after 500-trial Optuna search

New code (DIoU + Kalman dynamics + conf-weight + age-discount + two-stage)
tuned by Optuna achieves 57.675 vs 53.217 baseline (+8.4%).

---
Co-authored-by: Claude Code <noreply@anthropic.com>

Author: Borda

autotune/best_config.json

@@ -131,21 +131,21 @@
             }
         },
         "sdp": {
-            "hota": 55.656,
+            "hota": 57.67464748702108,
             "config": {
-                "lost_track_buffer": 26,
-                "track_activation_threshold": 0.9725,
-                "minimum_consecutive_frames": 1,
-                "minimum_iou_threshold": 0.275,
-                "max_interpolation_gap": 57,
-                "velocity_decay": 0.82,
-                "q_miss_alpha": 0.8,
-                "p_reset_threshold": 10,
-                "oru_threshold": 3,
-                "conf_cost_weight": 0.2,
-                "iou_age_weight": 0.0,
-                "high_conf_det_threshold": 0.0,
-                "stage2_iou_threshold": 0.05
+                "lost_track_buffer": 82,
+                "track_activation_threshold": 0.2320478261407267,
+                "minimum_consecutive_frames": 2,
+                "minimum_iou_threshold": 0.06181804967868924,
+                "max_interpolation_gap": 31,
+                "velocity_decay": 0.5238022129493903,
+                "q_miss_alpha": 0.7898317380243735,
+                "p_reset_threshold": 12,
+                "oru_threshold": 2,
+                "conf_cost_weight": 0.3603385598416909,
+                "iou_age_weight": 0.1560674927180593,
+                "high_conf_det_threshold": 0.6281865321381218,
+                "stage2_iou_threshold": 0.24818749751865166
             }
         },
         "yoloworld": {
@@ -253,4 +253,4 @@
             }
         }
     }
-}
+}