kordoc: parse_metadata

src/mcp.ts uses internal metadata-only helpers, but the public npx kordoc surface does not expose that fast path. With npx only, emulate the tool by parsing JSON and returning just the metadata fields.

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.
• Do not proceed if the document is missing or the path is ambiguous.

Command