Find BigCommerce subscribers missing from Mailchimp

**Objective:** Find BigCommerce newsletter subscribers from the last `{lookback-days}` days (default 30) who are not in the Mailchimp audience named `{list-name}`.

**Step 1: Read the BigCommerce subscribers**

Call `bigcommerce-get-subscriber` (bigcommerce server) with `date-created.from` set to the start of the window. Keep `email`, `first-name`, `last-name`, `source` and `date-created`.

**Step 2: Confirm the audience**

Call `mailchimp-get-list` (mailchimp server) with `name` set to `{list-name}`. If it matches zero or more than one audience, list the matches (`list-id`, `name`, `number-of-members`) and stop.

**Step 3: Check each subscriber in Mailchimp**

For each subscriber (at most 50), call `mailchimp-get-list-member` (mailchimp server) with `email` set to the subscriber email and `list-name` set to `{list-name}`. Record the member `status` or that no member exists.

**Step 4: Report**

Three lists: subscribers missing from Mailchimp, subscribers present with status other than subscribed (unsubscribed, cleaned, pending), and a count of those that match. Include `email`, name, `source` and `date-created` for the first two.

**Rules & Guidelines:**

* `bigcommerce-*` tools run on the bigcommerce server and `mailchimp-*` tools on the mailchimp server. Both servers must be connected.
* This prompt is read-only. Never call `mailchimp-add-list-member` or `mailchimp-update-list-member`, and never call any `bigcommerce-*-add`, `-update` or `-delete` tool. Use the add prompt to fix the gap.

**Validation:**

* Never recommend re-adding a person whose Mailchimp status is unsubscribed or cleaned.
* If more than 50 subscribers were returned, say only the first 50 were checked.