refactor: add stream module index re-exports (Issue #3594)

[oyi77]

Part of modularization effort (Issue #3594).

Adds open-sse/utils/stream/index.ts to re-export all stream modules.

Changes:

• New file: open-sse/utils/stream/index.ts (9 lines)
• Re-exports all stream modules: types, utils, responsesLifecycle, textualToolCalls, sseFormatters, errors, claudeLifecycle, openaiChunks, streamCore

Usage:

import { createSSEStream, FORMATS, ... } from '@/utils/stream';

Depends on: All prior stream module PRs (#3917-#3927).

[gemini-code-assist]

Code Review

This pull request introduces an index file open-sse/utils/stream/index.ts to export various stream-related modules. The review feedback correctly points out that using explicit .ts extensions in relative export paths is discouraged in TypeScript and can lead to compiler errors, suggesting they be omitted.

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[gemini-code-assist]

In TypeScript, exporting files with an explicit .ts extension is generally discouraged and can cause compiler errors (such as TS2691: 'An import path cannot end with a ".ts" extension') depending on the project's TypeScript configuration. It is recommended to omit the .ts extension in relative export paths to ensure compatibility with standard TypeScript module resolution and bundlers.

Suggested change

	export * from "./types.ts";
	export * from "./utils.ts";
	export * from "./responsesLifecycle.ts";
	export * from "./textualToolCalls.ts";
	export * from "./sseFormatters.ts";
	export * from "./errors.ts";
	export * from "./claudeLifecycle.ts";
	export * from "./openaiChunks.ts";
	export * from "./streamCore.ts";
	export * from "./types";
	export * from "./utils";
	export * from "./responsesLifecycle";
	export * from "./textualToolCalls";
	export * from "./sseFormatters";
	export * from "./errors";
	export * from "./claudeLifecycle";
	export * from "./openaiChunks";
	export * from "./streamCore";

[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.