fix: #3459 add opt-in recovery for missing function tools#3461
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This pull request resolves #3459 by adding an opt-in
RunConfig.tool_not_found_behavior="return_error_to_model"mode for unresolved function tool calls. The default remainsraise_error, preserving the currentModelBehaviorErrorbehavior unless callers explicitly opt in.When enabled, the runner records the unresolved function call, appends a model-visible
function_call_outputerror for the samecall_id, and runs the model again so it can recover. The change also extendstool_error_formatterwithkind="tool_not_found"for custom model-visible messages, exports the new behavior type, documents the option, and covers direct processing, non-streaming runs, streaming runs, mixed known/missing tool calls, formatter fallback behavior, session persistence, and public constructor compatibility.