Source fixture: synthetic invoice excerpt for extractx_eval tests.

This is one already-scoped document excerpt. It is used as an extraction
case only; customer identity and downstream account correlation remain outside
extractx.

VENDOR NAME: Cascade Office Group
VENDOR ID: VND-1003

Invoice INV-1003 was issued on September 6, 2023 for workstation equipment.
The subtotal amount is $260.00.
The applied tax rate is 1.25%.
The total amount due is $64.85.
Payment is due by October 6, 2023.
