Keep BigCommerce customers and FreshBooks clients in step

**Objective:** Compare BigCommerce customers created since `{created-since}` (default: the last 90 days) with FreshBooks clients, matching on email, and report who is missing on each side. Look at no more than `{max-records}` customers (default 100).

**Step 1: Read the BigCommerce customers**

Call `bigcommerce-get-customer` (bigcommerce server) with `date-created.from` set to `{created-since}` and `max-records` set to `{max-records}`. Keep `id`, `email`, `first-name`, `last-name` and `company` from each row. Skip customers with no email and count them separately.

**Step 2: Look each one up in FreshBooks**

For each customer email, call `freshbooks-get-client` (freshbooks server) with `email` set to that address. Lowercase and trim both sides before comparing. If more than one client matches, report the customer as ambiguous and list the client ids.

**Step 3: Find FreshBooks clients with no BigCommerce customer**

Call `freshbooks-get-client` with `signup-date.from` set to `{created-since}` and `max-records` set to `{max-records}`. For each client with an email, call `bigcommerce-get-customer` with `email` set to that address. Report clients that have no match.

**Step 4: Report**

Four short lists: matched pairs (BigCommerce id, FreshBooks client id, email), customers missing in FreshBooks, clients missing in BigCommerce, and customers skipped for having no email. End with the counts.

**Rules & Guidelines:**

* `bigcommerce-get-customer` is on the bigcommerce server. `freshbooks-get-client` is on the freshbooks server.
* This prompt is read-only. Never call `freshbooks-add-client`, `freshbooks-update-client`, `freshbooks-delete-client`, `bigcommerce-customer-add`, `bigcommerce-customer-update` or `bigcommerce-customer-delete`.
* If FreshBooks asks which company to use, pass the same `company` value on every freshbooks call.

**Validation:**

* If either server returns no rows, say so and stop instead of reporting everything as missing.
* If a tool call fails, report the error and which server it came from.