Introduce a transforming interceptor to EventHandler#1424

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onLLMPromptTransforming

Commits on Jan 27, 2026

Introduce a transforming interceptor onLLMPromptTransforming to EventHandler feature that can modify the prompt before sending it to an LLM
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Commits on Jan 29, 2026

Add a test with persisting the context in `onLLMCallCompleted`
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Remove tools parameter from onLLMPromptTransforming and LLMPromptTransformingContext because it's likely not needed for prompt transformations
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