Find new BigCommerce customers missing from Nutshell

**Objective:** List BigCommerce customers created in the last `{lookback-days}` days (default 30) that have no matching contact in Nutshell, up to `{max-customers}` customers (default 25).

**Step 1: List recent customers**

Call `bigcommerce-get-customer` with `date-created.from` set to today minus `{lookback-days}` days and `max-records` set to `{max-customers}`. Keep `id`, `name`, `email`, `company` and `date-created`.

**Step 2: Check each one in the CRM**

For each customer, call `nutshell-get-contact` with `name` set to the customer `name`. A customer matches when a returned contact has `emails` containing the customer `email`. If the name search returns nothing, try `name.contains` with the last name before declaring a miss.

**Step 3: Report**

Report a table of the customers with no CRM contact: name, email, company and created date. Then give counts: customers checked, matched, missing. For matched customers with a different name spelling, list them separately as possible duplicates.

**Rules & Guidelines:**

* `bigcommerce-*` tools are on the bigcommerce server and `nutshell-*` tools are on the nutshell server. Both servers must be connected.
* This is read-only. Never call any add, update or delete tool on either server (for example `bigcommerce-customer-update`, `nutshell-add-person`, `nutshell-update-lead`, `nutshell-delete-company`).
* Keep to the requested number of customers; do not page through the whole customer list.

**Validation:**

* If BigCommerce returns no customers, say so and stop.
* A customer with an empty email can only be matched by name; mark it as a weak match.