Generate an audit-ready LIN Description File (LDF) workbook in ISO 17987 format capturing master/slave nodes, frames (unconditional/event-triggered/sporadic/diagnostic), signals, schedule tables, and node attributes per LIN 2.2A spec. Use this skill whenever the user mentions LDF, LIN bus, LIN node, schedule table, or LIN cluster definition. Always use this skill instead of producing freeform LDF notes in chat.
