Catch BigCommerce orders missing from Intacct before month end

**Objective:** Find BigCommerce orders from the last `{lookback-days}` days (default 7) that have no matching Intacct order entry document, or whose totals differ, optionally limited to the customer with email `{email}`.

**Step 1: Read the orders from BigCommerce**

Call `bigcommerce-get-order` (bigcommerce server) with `date-created.from` set to the start of the window, and `billing-email` set to `{email}` if one was given. Ignore orders whose `status` is Cancelled, Declined or Incomplete. Keep `id`, `date-created`, `total-including-tax`, `currency-code`, `billing-email` and `status`. If more than 100 orders come back, work on the first 100 and say the list was capped.

**Step 2: Read the documents from Intacct**

Call `intacct-get-order-entry-document` (intacct server) with `document-date.from` set to the day before the window starts. Keep `document-id`, `document-number`, `reference-number`, `customer-po-number`, `customer-name`, `total`, `state` and `document-date`.

**Step 3: Match**

For each BigCommerce order, look for an Intacct document whose `reference-number` or `customer-po-number` equals the BigCommerce order `id` (compare as text). If none matches, report the order as missing from Intacct. If one matches, compare `total` with `total-including-tax` and report a difference larger than 0.01. Also list Intacct documents in the window whose reference matches no BigCommerce order.

**Step 4: Report**

Show a count of orders checked, matched, missing and mismatched, then a table of the missing and mismatched orders with order id, date, customer email, BigCommerce total, Intacct total and the gap.

**Rules & Guidelines:**

* `bigcommerce-get-order` is on the bigcommerce server. `intacct-get-order-entry-document` is on the intacct server.
* This prompt only reads. 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.
* If the reference convention is not the order id, say so after finding that nothing matches, and do not guess another key.
* Intacct totals may be tax-exclusive; if every matched pair differs by the same ratio, mention it instead of listing each one.

**Validation:**

* If either side returns nothing, say which and stop.
* Report orders whose `currency-code` differs from the Intacct document currency as not comparable.