- Introduced a `fetch` option on `StreamOptions` and threaded it through providers to let callers supply a custom request transport.
- Updated provider clients and direct HTTP calls across Anthropic, OpenAI, Azure, Google, GitLab Duo, Gemini CLI, Ollama, and Codex flows to use the injected fetch implementation.
- Extended retry helper options to accept a fetch override and preserved preconnect support from the selected fetch function.
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