- isThinkingPart now only checks thought === true, not thoughtSignature - thoughtSignature is for context replay and can appear on any part type - Store thoughtSignature on text blocks as textSignature for proper replay - Remove id from functionCall/functionResponse (unsupported by Vertex/Cloud Code Assist) Refs: https://ai.google.dev/gemini-api/docs/thought-signatures Co-authored-by: Amp <amp@ampcode.com>