feat(rag): add shared retriever for audit pipeline

fastapi_modules/fastapi_leaudit/leaudit_bridge/pipeline.py

@@ -24,6 +24,7 @@ from leaudit.ocr.base import BaseOCRClient
 from leaudit.ocr.models import OcrResult
 
 from fastapi_modules.fastapi_leaudit.leaudit_bridge.storage_adapter import StorageAdapter
+from fastapi_modules.fastapi_leaudit.rag_engine.retriever import RagRetriever
 
 log = logging.getLogger(__name__)
 
@@ -89,10 +90,12 @@ class LauditPipeline:
         ocr_client: BaseOCRClient,
         llm_client: BaseLLMClient | None = None,
         storage_adapter: StorageAdapter | None = None,
+        rag_retriever: RagRetriever | None = None,
     ) -> None:
         self.ocr_client = ocr_client
         self.llm_client = llm_client
         self.storage = storage_adapter or StorageAdapter()
+        self.rag_retriever = rag_retriever or RagRetriever()
 
     async def run(
         self,
@@ -219,6 +222,7 @@ class LauditPipeline:
             visual_manifest=visual_manifest,
             phase=detected_phase,
             external_mocks=external_mocks,
+            retriever=self.rag_retriever,
         )
         timing["evaluation"] = round(time.time() - t0, 2)
         log.info(