Refactor PromptBundle into individual prompts

Author: strickvl

deep_research/materializers/__init__.py

@@ -7,14 +7,14 @@
 """
 
 from .approval_decision_materializer import ApprovalDecisionMaterializer
-from .prompts_materializer import PromptsBundleMaterializer
+from .prompt_materializer import PromptMaterializer
 from .pydantic_materializer import ResearchStateMaterializer
 from .reflection_output_materializer import ReflectionOutputMaterializer
 from .tracing_metadata_materializer import TracingMetadataMaterializer
 
 __all__ = [
     "ApprovalDecisionMaterializer",
-    "PromptsBundleMaterializer",
+    "PromptMaterializer",
     "ReflectionOutputMaterializer",
     "ResearchStateMaterializer",
     "TracingMetadataMaterializer",