Find recent BigCommerce customers missing from HubSpot

**Objective:** Find BigCommerce customers created in the last `{lookback-days}` days (default 30) that have no HubSpot contact, and report how many were checked.

**Step 1: Read customers from BigCommerce**

Call `bigcommerce-get-customer` with `date-created.from` set to today minus the lookback, and `max-records` of `{max-customers}` (default 50). Keep `id`, `name`, `email`, `company`.

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

For each customer call `hubspot-get-contacts` with `email` set to the BigCommerce `email`. Compare case-insensitively. A customer with no email is reported as unmatchable and skipped.

**Step 3: Report**

A table of customers with no HubSpot contact (BigCommerce id, name, email, company), then a table of customers matched but with a different `last-name` or `company-name`, then counts: checked, matched, missing, mismatched.

**Rules & Guidelines:**

* `bigcommerce-get-customer` is on the bigcommerce server; `hubspot-get-contacts` is on the hubspot server.
* Read only. Do not call `hubspot-add-contact`, `hubspot-update-contact`, `bigcommerce-customer-add` or `bigcommerce-customer-update`.

**Validation:**

* If BigCommerce returns no customers, say so and stop.
* If more than one HubSpot contact matches an email, list them all and flag it as a duplicate.
* If `max-records` was reached, say the result may be incomplete.