LangChain 1.2.16

Changes since langchain==1.2.15

release(langchain): 1.2.16 (#37085) chore(docs): update x handle references (#37081) release(anthropic): 1.4.2 (#37061) perf(langchain): stop inlining agent state into tool-dispatch Sends (#36960) docs(langchain): correct import paths in agent middleware docstrings (#36987) hotfix: bump min core versions (#36996) release(openai): 1.2.1 (#36995) feat(core): add content-block-centric streaming (v2) (#36834) fix(fireworks): honor max_retries (#36973) release(openai): 1.2.0 (#36961) docs(langchain): correct import path in ModelCallLimitMiddleware docstring (#36895) feat(langchain): ls_agent_type tag on create_agent calls (#36774) release(core): release 1.3.0 (#36851) chore: bump langsmith from 0.6.3 to 0.7.31 in /libs/langchain_v1 (#36800) chore(deps): bump pytest to 9.0.3 (#36801) chore: bump pytest from 9.0.2 to 9.0.3 in /libs/langchain_v1 (#36717) chore: bump pillow from 12.1.1 to 12.2.0 in /libs/langchain_v1 (#36710) test(langchain): test cache hit/miss on lru (#36659) perf(langchain): add lru cache when resolving types (#36649) perf(langchain): add another init test with middleware (#36644) chore(core): reduce streaming metadata / perf (#36588) perf(langchain): add benchmark command (#36641) chore: bump cryptography from 46.0.6 to 46.0.7 in /libs/langchain_v1 (#36619) docs(langchain): add missing baseten and litellm to init_chat_model (#36562) release(core): 1.2.26 (#36511)