Refine Product Requirement Document

Update it_{current_iteration}_product-requirement-document.md in place based on user feedback. The file must already exist; this skill does not create it from scratch.

Do NOT start implementing. Only update the document.

Two modes available — the agent asks at the start:

• Editor mode — apply specific changes requested by the user.
• Challenger mode — act as an independent critical reviewer: challenge assumptions, question scope, find gaps, and propose improvements. The user accepts or rejects each suggestion before anything is written.

The Job