Find Chargebee credit notes missing from Intacct

**Objective:** List Chargebee credit notes from the last `{lookback-days}` days (default 30) and check each one has a matching customer adjustment in Intacct.

**Step 1: Credit notes in Chargebee**

Call `chargebee-get-credit-note` (Chargebee server) with `date.from` set to the start of the window, and `customer-id` `{chargebee-customer-id}` when supplied. Record id, customer id, reference invoice id, total, reason code and date.

**Step 2: Adjustments in Intacct**

For each distinct customer, resolve the Intacct customer with `intacct-get-customer` (Intacct server) by the company name from `chargebee-get-customer` (Chargebee server) with `id`. Then call `intacct-get-ar-adjustment` (Intacct server) with `customer-id`, `adjustment-date.from` set to the start of the window and, where possible, `reference-invoice-number` set to the Chargebee reference invoice id.

**Step 3: Report**

Table per credit note: Chargebee id, customer, total, reason, matching Intacct adjustment number and amount, or "missing in Intacct". Sort missing ones first and give totals of missing and mismatched amounts per currency.

**Rules & Guidelines:**

* `chargebee-get-credit-note` and `chargebee-get-customer` are Chargebee tools; `intacct-get-customer` and `intacct-get-ar-adjustment` are Intacct tools.
* Read-only. Never call `intacct-create-order-entry-document` or any Intacct create or update tool.

**Validation:**

* If a customer cannot be matched in Intacct, list its credit notes as unmatched customer and move on.
* If there are no credit notes in the window, say so and stop.