Fill the gaps when Shopify orders never reached Rillet

**Objective:** Record every Shopify order created from `{from-date}` to `{to-date}` (default: yesterday) that has no Rillet invoice yet as a Rillet AR-only invoice against the Rillet product `{rillet-product-name}`, after the user confirms the list.

**Step 1: Read the Shopify orders**

Call `shopify-get-order` with created-at.from and created-at.to set to the range. Skip orders with cancelled-at set, and skip orders whose financial-status shows they were voided. Note order-id, name, created-at, email, customer-id, currency, subtotal-price, total-tax and total-price.

**Step 2: Find the gaps**

Call `rillet-get-invoices` (it takes no filters). An order already has an invoice if any invoice-number equals the order name, compared with and without the leading #. Keep only the orders with no match.

**Step 3: Resolve the Rillet references**

* Product: call `rillet-get-products` and find the product whose name equals `{rillet-product-name}`. If none or more than one matches, list the candidates and stop.
* Customer: call `rillet-get-customer-emails` and match the order email to email. If exactly one Rillet customer-id matches, use it. Otherwise, if `{fallback-customer-name}` was given, call `rillet-get-customers` and use the customer whose name equals it. If neither resolves, list the order under "no customer" and do not create it.

**Step 4: Confirm**

Show a table of the invoices you will create: order name, date, Rillet customer name, net amount (total-price minus total-tax), tax, total, currency. Show the "no customer" orders separately. Ask the user to confirm. Create nothing until they do.

**Step 5: Create**

For each confirmed order, call `rillet-add-invoice-ar-only` once with:

* invoice-number: the Shopify order name, exactly as Shopify shows it
* invoice-date: the order created-at date
* customer-id: the resolved Rillet customer
* external-system: Shopify
* external-id: the Shopify order-id
* line1-product-id: the resolved product, line1-quantity 1, line1-currency the order currency
* line1-total: total-price minus total-tax
* tax-amount: total-tax, tax-currency the order currency
* line1-description: Shopify order followed by the order name

**Step 6: Report**

A table of created invoices with the returned id, a list of any that failed with the error as returned, and the orders skipped for no customer.

**Rules & Guidelines:**

* `shopify-get-order` is on the shopify server. `rillet-get-invoices`, `rillet-get-products`, `rillet-get-customer-emails`, `rillet-get-customers` and `rillet-add-invoice-ar-only` are on the rillet server.
* `rillet-add-invoice-ar-only` is the only write tool this prompt may call, once per confirmed order. Do not call `rillet-add-invoice`, `rillet-add-invoice-revenue-only`, `rillet-update-invoice` or `rillet-add-invoice-payment`. Recording the payment is the apply-shopify-payments prompt.
* Do not call any shopify write tool. Shopify is read-only here.
* Re-read `rillet-get-invoices` immediately before creating if more than a few minutes passed since Step 2, so a second run does not create duplicates.

**Validation:**

* If there are no gaps, say every order in the range already has a Rillet invoice and stop.
* If a create fails, report it and continue with the rest. Do not retry with altered values.
* If the user does not confirm, create nothing.