Find Freshdesk contacts missing from BigCommerce customers

**Objective:** Reconcile Freshdesk contacts and BigCommerce customers by email, for up to `{max-records}` records from each side (default 100), optionally limited to Freshdesk company `{company-id}`.

**Step 1: Read Freshdesk**

Call `freshdesk-get-contacts` (Freshdesk server) with `max-records`, and `company-id` if one was given. Keep `email`, `name`, `company-id`, `phone`.

**Step 2: Read BigCommerce**

Call `bigcommerce-get-customer` (BigCommerce server) with `max-records`. For each Freshdesk email not found in that page, call `bigcommerce-get-customer` with `email` to confirm before calling it missing.

**Step 3: Compare**

Match on lower-cased email. For matches, compare name and phone and note differences. Also call `freshdesk-get-companies` with `company-id` where needed, and compare the company name to the BigCommerce `company` field.

**Step 4: Report**

Counts first: matched, Freshdesk-only, BigCommerce-only (within the page read), matched with differences. Then up to 20 examples of each group.

**Rules & Guidelines:**

* `freshdesk-get-contacts` and `freshdesk-get-companies` are Freshdesk tools; `bigcommerce-get-customer` is the BigCommerce tool.
* Do not call any write tool on either server (no freshdesk-add-*, freshdesk-update-*, freshdesk-delete-*, freshdesk-reply-to-ticket, and no bigcommerce-*-add, -update or -delete tools).
* A BigCommerce-only result from the page read is only a candidate; say the page was limited.

**Validation:**

* Contacts with no email cannot be matched; count them separately.
* If either side returns nothing, report that and stop.