Find BigCommerce customers with no Intacct customer record

**Objective:** Find BigCommerce customers created in the last `{lookback-days}` days (default 30) that have no matching Intacct customer, ordered by how much they have bought.

**Step 1: Read the new customers from BigCommerce**

Call `bigcommerce-get-customer` (bigcommerce server) with `date-created.from` set to the start of the window. If more than 50 come back, work on the first 50 and say the list was capped. Keep `id`, `name`, `company`, `email` and `date-created`.

**Step 2: Check each one in Intacct**

For each customer call `intacct-get-customer` (intacct server) with `customer-name.contains` set to the `company` if present, otherwise the `name`. Treat the customer as present when a returned `customer-name` equals that value case-insensitively; treat it as absent when nothing comes back or nothing equals it. Report near matches separately as possible duplicates with their `customer-id`.

**Step 3: Add spend for the missing ones**

For each absent customer call `bigcommerce-get-order` (bigcommerce server) with `customer-id` set to the BigCommerce id and total the order count and `total-including-tax`.

**Step 4: Report**

Show the counts checked, present, possible duplicates and missing, then a table of the missing customers with name, company, email, created date, order count and spend, highest spend first.

**Rules & Guidelines:**

* `bigcommerce-get-customer` and `bigcommerce-get-order` are on the bigcommerce server. `intacct-get-customer` is on the intacct server.
* This prompt only reads. It does not create the missing customers. Never call any `bigcommerce-customer-add`, `bigcommerce-customer-update`, `bigcommerce-customer-delete`, `bigcommerce-product-add`, `bigcommerce-product-update` or other bigcommerce add, update or delete tool, and never call `intacct-create-customer`, `intacct-update-customer`, `intacct-create-vendor`, `intacct-create-order-entry-document`, `intacct-update-order-entry-document` or any other Intacct create or update tool.

**Validation:**

* If no customers were created in the window, say so and stop.
* Customers with no company and a common name are ambiguous; mark them as unverified rather than missing.