Feat: LiteLlm: Make LiteLLM file attachment failures consistent by raising explicit errors instead of silent fallback#5547

Lin-Nikaido wants to merge 4 commits intogoogle:maingoogle/adk-python:mainfrom

Lin-Nikaido:feat/litellm-attachment-failuresLin-Nikaido/adk-python:feat/litellm-attachment-failuresCopy head branch name to clipboard