first commit

configs/rerankers/config.py

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+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+class RerankerConfig(BaseModel):
+    """Configuration for rerankers."""
+
+    provider: str = Field(description="Reranker provider (e.g., 'cohere', 'sentence_transformer')", default="cohere")
+    config: Optional[dict] = Field(description="Provider-specific reranker configuration", default=None)
+
+    model_config = {"extra": "forbid"}