Changes since langchain-tests==0.3.14
tests: release 0.3.15 (#30397)
multiple: enforce standards on tool_choice (#30372)
multiple: support strict and method in with_structured_output (#30385)
langchain-tests: skip instead of passing image message tests (#30375)
langchain-tests: allow subclasses to add addition, non-standard tests (#30204)
openai[patch]: support structured output via Responses API (#30265)
standard tests: test simple agent loop (#30268)
standard-tests, openai: bump core (#30202)