Find 2Checkout leads that are missing from Salesforce

**Objective:** Find 2Checkout leads (optionally limited to country `{country-code}`) whose email does not exist in Salesforce as a lead or contact, and report them.

This prompt needs both servers connected: 2checkout (tools whose names start with 2checkout-) and salesforce (tools whose names start with salesforce-).

**Step 1: List the 2Checkout leads**

Call `2checkout-get-lead` (2checkout server). If `{country-code}` is not empty, pass it as `billing-country-code`. Keep lead code, name, email, city and country. If more than 50 leads come back, work through the first 50 and say that the list was cut.

**Step 2: Check Salesforce**

For each lead email, call `salesforce-get-lead` (salesforce server) with `email`; if nothing, call `salesforce-get-contact` (salesforce server) with `email`. A lead with a match in either is covered.

**Step 3: Report**

Give counts of leads checked, covered and missing, then a table of the missing leads (lead code, name, email, company if present, city, country). Leads with no email are listed separately as unmatchable.

**Rules & Guidelines:**

* 2Checkout tools are on the 2checkout server; Salesforce tools are on the salesforce server.
* Read-only. Never call `salesforce-add-lead`, `salesforce-add-contact` or any other write tool; the sync-leads-to-salesforce prompt does the creating.

**Validation:**

* Compare emails case-insensitively.
* If 2Checkout returns no leads, say so and stop.