Minimize model_config.json (only loader-required fields)

model_config.json

@@ -1,13 +1,8 @@
 {
-  "model_type": "LCLM",
-  "schema_version": 1,
-  "encoder_name": "Qwen/Qwen3-Embedding-0.6B",
-  "decoder_name": "Qwen/Qwen3-4B-Instruct-2507",
+  "adapter_type": "mlp",
+  "encoder_mask_type": "causal",
   "encoder_window_size": 1024,
   "pooling": "mean",
-  "encoder_mask_type": "causal",
   "boundary_overlap": 0,
-  "adapter_type": "mlp",
-  "num_adapter_layers": 1,
   "compression_ratio": 8
 }