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## Summary This PR standardizes all text file I/O to use `UTF-8`. This eliminates OS-specific defaults (e.g. Windows `cp1252`) and ensures consistent, Unicode-safe behavior across platforms. ## Breaking changes Users on systems with a default encoding which is not utf-8 may see decoding errors from the following code paths: * langchain_core.vectorstores.in_memroy.InMemoryVectorStore.load * langchain_core.prompts.loading.load_prompt * `from_template` in AIMessagePromptTemplate, HumanMessagePromptTemplate, SystemMessagePromptTemplate ## Migration Change the encoding of files that are encoded with a non utf-8 encoding to utf-8.