kordoc: parse_form

Reproduce the parse_form logic from src/mcp.ts: parse the document, then run extractFormFields.

Input Requirements

• Require exactly one target document.
• Require the user to attach the document or provide a concrete local path.
• Accept only supported formats: .hwp, .hwpx, .pdf.
• Prefer form-like or table-heavy office documents.
• Do not proceed if the document is missing.

Command