Fix broken type inference tests in requestMethods

[jasonkuhrt]

Problem

Three tests in src/extensions/DocumentBuilder/methods-instance/ are failing with type inference issues:

1. requestMethods.test-d.ts:7 - Expected {id2: string | null} | null but getting {} | null
2. requestMethods.test-d.ts:13 - Parameter type assertion failure
3. requestMethods.defer-client.integration.test.ts:180 - Type mismatch on array fields

These failures exist on BOTH main and refactor branches - they are pre-existing bugs, not regressions.

Files

• src/extensions/DocumentBuilder/methods-instance/requestMethods.test-d.ts
• src/extensions/DocumentBuilder/methods-instance/requestMethods.defer-client.integration.test.ts

Impact

Blocks CI from being 100% green