fix: align Responses parallel tool calls with converted tools - #4405
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This pull request fixes Responses request construction so
parallel_tool_callsis derived from the actual converted provider tool payload instead of the raw SDK tool list.Handoff-only requests now preserve explicit
TrueandFalsesettings, while requests without converted tools omit the setting. The change applies consistently to the core OpenAI Responses and AnyLLM Responses paths, preserves shared streaming and non-streaming behavior, and leaves Chat Completions unchanged.It also adds focused matrices covering no tools, function tools, and handoff-only tools with
True,False, andNone.