Find 2Checkout orders that were never invoiced in Rillet

**Objective:** Find 2Checkout orders (optionally for billing last name `{billing-last-name}`, up to `{max-records}` orders, default 25) that have no invoice in Rillet.

**Step 1: Read orders from 2Checkout**

Call `2checkout-get-order` with `billing-last-name` set to `{billing-last-name}` if given and `max-records` set to `{max-records}` (25 if empty). Keep `reference-number`, `order-date`, `status`, `currency`, `gross-discounted-price`, `external-reference`, `billing-first-name`, `billing-last-name` and `test-order`. Exclude orders where `test-order` is true and count them.

**Step 2: Read invoices from Rillet**

Call `rillet-get-invoices` (no filters, read all rows). Keep `invoice-id`, `invoice-number`, `purchase-order-number`, `memo`, `customer-id`, `total`, `currency` and `status`.

**Step 3: Match**

An order is invoiced when its `reference-number` or `external-reference` appears in a Rillet `invoice-number`, `purchase-order-number` or `memo`. For matches, compare `gross-discounted-price` with `total` and flag any difference or currency mismatch.

**Step 4: Report**

Give three lists: orders with no Rillet invoice (reference, date, buyer, amount), matched orders with an amount or currency mismatch, and matched orders in agreement (count only). Note that invoices created outside this link will show up as missing.

**Rules & Guidelines:**

* Tools whose names start with 2checkout belong to the 2checkout server and tools whose names start with rillet belong to the Rillet server. Both servers must be connected.
* The join is the order reference carried in the Rillet invoice number, purchase order number or memo. It is a text match, not a key, so say how many matches were made on each field.
* This is read-only: never call any 2checkout action tool (any 2checkout tool that adds, updates, cancels, refunds, enables, disables or renews) and never call any Rillet tool that adds, updates, applies, unapplies, records or sets, such as `rillet-add-customer`, `rillet-add-invoice-ar-only`, `rillet-add-invoice-revenue-only`, `rillet-add-invoice-payment`, `rillet-add-credit-memo`, `rillet-update-customer`, `rillet-update-invoice` and `rillet-set-invoice-sent-status`.

**Validation:**

* If `2checkout-get-order` returns nothing, say so and stop.
* If `rillet-get-invoices` returns nothing, report every order as missing and say Rillet has no invoices.
* If a reference appears on more than one invoice, list them and do not pick one.