refactor: extract OpenAI chunks to open-sse/utils/stream/openaiChunks.ts (Issue #3594)

[oyi77]

Part of modularization effort (Issue #3594).

Extracts OpenAI intermediate chunk handling from the monolithic open-sse/utils/stream.ts into a dedicated module.

Changes:

• New file: open-sse/utils/stream/openaiChunks.ts (9 lines)
• Exports: getOpenAIIntermediateChunks

Testing: No behavior change. Existing stream tests pass.

Follow-up PRs will extract: types (#3917), utils (#3918), errors (#3919), textualToolCalls (#3920), sseFormatters (#3923), claudeLifecycle, responsesLifecycle, and streamCore.

[gemini-code-assist]

Code Review

This pull request introduces a new utility file open-sse/utils/stream/openaiChunks.ts with the getOpenAIIntermediateChunks function. The review feedback correctly identifies unused imports (convertOpenAIToResponsesToolCall and uuidv4) in the newly added file and suggests removing them to maintain clean code.

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[gemini-code-assist]

The imports convertOpenAIToResponsesToolCall and uuidv4 are unused in this file and should be removed to maintain clean code.

Suggested change

	import { convertOpenAIToResponsesToolCall } from "../handlers/responseTranslator.ts";
	import { v4 as uuidv4 } from "uuid";
	import { JsonRecord } from "./types.ts";
	import { JsonRecord } from "./types.ts";

[diegosouzapw]

Thanks, @oyi77 🙏. These stream extractions are currently additive — the new modules under open-sse/utils/stream/ aren't wired into stream.ts yet, so they don't change runtime behavior on their own. Rather than land the decomposition in fragments, we're going to fold the stream split into the single coordinated modularization pass (Issue #3594) after the quality-gate work lands, so the extraction and the rewiring get sequenced together and verified lossless in one go. Closing for now — purely sequencing, not a reflection on the work; input welcome on #3594 once the plan is up.