Find Chargebee credit notes with no Business Central credit memo

**Objective:** For credit notes issued since `{date-from}` (optionally only for `{customer-id}`), confirm each has a posted sales credit memo in Business Central for the same amount.

**Step 1: Read the Chargebee credit notes**

Call `chargebee-get-credit-note` (Chargebee server) with `date.from` set to `{date-from}` and `customer-id` set to `{customer-id}` when given, `max-records` 50. Keep `id`, `customer-id`, `reference-invoice-id`, `total`, `reason-code`, `status`, `amount-refunded` and `currency-code`. Stop if there are none.

**Step 2: Resolve customers**

For each distinct `customer-id`, call `chargebee-get-customer` (Chargebee server) with `id`, then `business-central-get-customer` (Business Central server) with its `email`, and keep `customer-number`. Mark credit notes for customers not found as "customer missing in Business Central".

**Step 3: Find the credit memos**

Call `business-central-get-posted-sales-credit-memo` (Business Central server) with `sell-to-customer-number` and `posting-date.from` set to `{date-from}`. Match on `external-document-number` equal to the credit note `id`, then on `applies-to-document-number` equal to `reference-invoice-id`, then on equal `total-amount-including-tax`. Label the rule used.

**Step 4: Report**

Summarise counts of matched, amount-different, unmatched and customer-missing. List every exception with Chargebee credit note id, reason code, total, matched credit memo number and total, and difference. Mention refunded amounts that have no refund-related ledger evidence only if `business-central-get-detailed-customer-ledger` (Business Central server, filtered by `customer-number` and `document-type`) shows nothing for them.

**Rules & Guidelines:**

* `chargebee-get-credit-note` and `chargebee-get-customer` are on the Chargebee server; the other Business Central tools named here are on the Business Central server.
* Read-only. Do not call `business-central-create-sales-credit-memo` or any other create or update tool.

**Validation:**

* If a credit note has several candidate memos, list them and do not choose.
* Compare in the original currency; flag currency differences.