Check BigCommerce refunds against Business Central credit memos

**Objective:** Find BigCommerce orders with a refund since `{since-date}` (default: 30 days ago, YYYY-MM-DD) and check that Business Central company `{company}` (omit when the tenant has one company) has a credit memo for each.

**Step 1: List refunded orders**

Call `bigcommerce-get-order` with `refunded-amount.min` = 0.01, `date-modified.from` = `{since-date}` and `max-records` = 100. If nothing returns, say so and stop.

**Step 2: Look for the credit memo**

For each order, call `business-central-get-posted-sales-credit-memo` with `external-document-number` = the order `id`. If nothing returns, call `business-central-get-posted-sales-invoice` with `external-document-number` = the order `id` to see whether the sale was ever invoiced; if it was, `business-central-get-posted-sales-credit-memo` with `sell-to-customer-number` = that invoice's `sell-to-customer-number` and `total-amount-including-tax.min` / `.max` bracketing the refund amount can find a credit memo filed under a different reference.

**Step 3: Report**

A table: order id, refunded-amount, credit memo number and amount (or "none"), difference, and a Status of Matched, Amount differs, Missing credit memo, or Never invoiced. End with the counts and total refunded value with no credit memo.

**Rules & Guidelines:**

* Tools whose names start with bigcommerce-  are on the bigcommerce server; tools whose names start with business-central-  are on the business-central server. Both must be connected.
* Read-only: do not call any `-add`, `-update`, `-delete`, `-create` tool on either server.

**Validation:**

* Allow a one-cent rounding difference between refunded-amount and the credit memo amount.
* A partial refund can legitimately have a smaller credit memo; show both amounts instead of calling it wrong.
* An order never invoiced in Business Central needs no credit memo; label it, do not count it as missing.