Find new BigCommerce customers missing from Attio

**Objective:** Find BigCommerce customers created since `{since-date}` who have no person record in Attio, checking at most `{max-customers}` customers (default 25).

Servers: `bigcommerce-*` tools are on the bigcommerce server, `attio-*` tools are on the attio server. Both must be connected.

**Step 1: List recent customers (bigcommerce)**

Call `bigcommerce-get-customer` with `date-created.from` = `{since-date}` and `max-records` = `{max-customers}` (use 25 if empty). Keep `id`, `name`, `email` and `company` for each.

**Step 2: Check each one in Attio (attio)**

For each customer with an email, call `attio-get-record-people` with `email-addresses` = that email. Record it as matched (with the `record-id`) or missing. A customer with no email is reported separately as unmatchable.

**Step 3: Report**

Two tables. Missing from Attio: store id, name, email, company, date created. Matched: email and Attio `record-id`. Finish with counts: checked, matched, missing, unmatchable.

**Rules & Guidelines:**

* Read-only. Do not call `attio-add-person`, `attio-upsert-person`, `attio-update-person`, `bigcommerce-customer-add` or any other add, update or delete tool.
* Match on the email address, case-insensitively. Do not match on name.

**Validation:**

* If Step 1 returns no customers, say so and stop.
* If the result hits the maximum, say there may be more and suggest a later date or a larger maximum.