fix(typescript): export Socket class from subpackage exports.ts when websocket clients are generated

[Swimburger]

Description

When WebSocket clients are generated in the TypeScript SDK, the generated Socket class (e.g. RealtimeSocket) was not exported from the subpackage's exports.ts file. Only the Client class was exported, making the Socket class inaccessible through the public exports path (src/exports.ts → core/exports.ts → ...).

Changes Made

• SdkGenerator.ts: In generateSubpackageExports(), added a named export for the Socket class from ./client/Socket when generateWebSocketClients is enabled and the package has a websocket channel. The export is placed between the Client export and the wildcard ./client/index re-export.
• Seed fixtures: Updated all websocket seed test exports.ts files (websocket, websocket-bearer-auth, websocket-inferred-auth) to include the new Socket export.
• versions.yml: Added version 3.58.1 changelog entry.

Review Checklist

• Verify the guard condition (this.generateWebSocketClients && package_.websocket != null) correctly limits the export to only packages with an actual websocket channel
• Verify packageId.subpackageId is safe — packageId.isRoot is checked false at the top of the loop before this code runs
• Confirm seed fixtures match expected generator output (CI seed tests will validate this)

Testing

• Seed test fixtures updated for all affected websocket variants (no-serde, serde, bearer-auth, inferred-auth)
• CI seed tests will verify generated output matches fixtures

Link to Devin session: https://app.devin.ai/sessions/507b82611d614885a0f11aba0b995f5e
Requested by: @Swimburger

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