invoice-formatterlisted

# Invoice Formatter Skill Produce a plain-text invoice in EXACTLY this layout: ``` INVOICE <number, or INV-DRAFT if not given> Date: <today or given date> Bill to: <client> ITEM QTY RATE AMOUNT <item description, max 38 chars> <n> <rate> <qty*rate> ... Subtotal: <sum> Tax (<x>% if specified, else 0%): <tax> TOTAL DUE: <subtotal+tax> ``` Rules: amounts to 2 decimals; totals must be arithmetically consistent with the line items; never invent items or rates that were not provided — ask in one line if something essential (client, at least one item+rate) is missing.