laravel/ai: Fix terminal Responses API stream handling
Format the changelog article according to the following specification: Format Requirements: - Markdown only - no prose explanations outside the article, no code fences, no code fences containing code fences, no code fences containing horizontal rules. The article must be a standalone Markdown document. *Frontmatter (YAML, wrapped in `---` ... wait, the spec says no horizontal rules? — actual spec:
