Add custom exceptions

src/vector_search_mcp/engine/base_engine.py

@@ -12,7 +12,7 @@ maintaining a consistent interface for the semantic search workflow.
 """
 
 from abc import ABC, abstractmethod
-from typing import Generic, TypeVar
+from typing import TypeVar
 
 from ..models import Condition, SearchRow
 
@@ -22,7 +22,7 @@ ConditionType = TypeVar("ConditionType")
 __all__ = ["BaseEngine"]
 
 
-class BaseEngine(ABC, Generic[ResponseType, ConditionType]):
+class BaseEngine[ResponseType, ConditionType](ABC):
     """Abstract base class for vector search engines.
 
     This class defines the interface that all vector search engine implementations