Changes since langchain-core==0.3.15
core[patch]: Release 0.3.16 (#28045)
docs: new stack diagram (#27972)
langchain_core: add file_type option to make file type default as png (#27855)
docs: fix trim_messages docstring (#27948)
core[patch]: make oai tool description optional (#27756)
core: fix CommaSeparatedListOutputParser to handle columns that may contain commas in it (#26365)
langchain[patch]: Add warning in react agent (#26980)
core: use friendlier names for duplicated nodes in mermaid output (#27747)