Patch Changes b251584: Preserve active text and reasoning parts when another merged UI message stream finishes a step, and align workflow stream normalization with the explicit part end chunks. 591d25b: feat: add batch completion webhooks. `experimental_startTextBatch` accepts a `webhookUrl`, and the gateway provider registers it through the batch `callbackUrl` contract and exports typed async-job metadata.

Direct Anthropic and OpenAI batch providers return an unsupported warning when the option is provided. 9de0baf: Parse structured generateText output when providers omit finishReason but return text. Updated dependencies [591d25b] @ai-sdk/gateway@4.0.64 @ai-sdk/provider@4.0.8 @ai-sdk/provider-utils@5.0.30