Add full Part 5 evaluation metrics (Grand Finale)

model_checkpoints/Primitive_Extractor/FSD50k/full_evaluation_result_part5.json

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+{
+  "dataset": "FSD50K Part 5 (Full - Grand Finale)",
+  "total_samples_evaluated": 8189,
+  "classes_detected": 199,
+  "metrics": {
+    "mAP_macro_percent": 71.17,
+    "micro_f1_score_percent": 63.77,
+    "macro_f1_score_percent": 50.01,
+    "top_1_hit_rate_percent": 85.04
+  },
+  "checkpoint_used": "best_fsd50k_primitive_part1_to_5.pt",
+  "analysis": "Full evaluation of the final fine-tuned model on the entire Part 5 dataset. Metrics demonstrate peak generalization and robust multi-label classification capabilities after completing the full FSD50K training pipeline."
+}