Refactor: separate CI-specific weight validation into dedicated module (#15216)

Co-authored-by: Kangyan-Zhou <zky314343421@gmail.com>

python/sglang/test/runners.py

@@ -31,6 +31,7 @@ from transformers import (
 )
 
 from sglang.srt.entrypoints.engine import Engine
+from sglang.srt.model_loader.ci_weight_validation import ci_validate_and_clean_hf_cache
 from sglang.srt.utils import is_npu, load_image
 from sglang.srt.utils.hf_transformers_utils import get_tokenizer
 from sglang.test.test_utils import DEFAULT_PORT_FOR_SRT_TEST_RUNNER, calculate_rouge_l
@@ -251,6 +252,10 @@ class HFRunner:
         # Apply model-specific patches
         monkey_patch_gemma2_sdpa()
 
+        # Validate and clean corrupted files in HF cache (CI only)
+        # This is needed because HFRunner bypasses SGLang's weight validation
+        ci_validate_and_clean_hf_cache(model_path)
+
         # Load the model and tokenizer
         if self.model_type == "generation":
             config = AutoConfig.from_pretrained(