feat: add invalid final output recovery handler - #3736
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This pull request adds an
invalid_final_outputrun error handler for structured output validation failures and missing structured final messages.The handler can return a schema-validated fallback, optionally append it to conversation history, and participates in the normal final-output hooks, guardrails, streaming events, and session persistence. Returning
Nonepreserves existing behavior: malformed non-empty output raisesModelBehaviorError, while empty structured output continues to another model turn.Recovery does not retry the model request or replay completed tool side effects. Explicit error-kind dispatch also prevents unrelated
ModelBehaviorErrorinstances from being handled accidentally.Resolves #325