Fix GoogleModel thinking signature not preserved in multi-turn conversations#3647

jerry-heygen wants to merge 2 commits intopydantic:mainpydantic/pydantic-ai:mainfrom

jerry-heygen:jerry/fix_empty_thinking_part_signature-12042025jerry-heygen/pydantic-ai:jerry/fix_empty_thinking_part_signature-12042025Copy head branch name to clipboard