Bring new WooCommerce buyers into Mailchimp, with consent handled

**Objective:** Add WooCommerce paying customers created in the last `{days-back}` days (default 30) who are not yet in the Mailchimp audience `{audience}`, using subscription status `{status}` (default pending, which sends a double opt-in email), after the user confirms the list.

**Step 1: Find the audience**

Call `mailchimp-get-list` with `name` set to `{audience}`. If nothing comes back, call it with `name.contains`. If none or more than one match, list what was found and stop. Note `list-id` and `name`.

**Step 2: Read the WooCommerce customers**

Work out the start date as today minus `{days-back}` days. Call `woocommerce-get-customer` with `created-date.from` set to that date and `paying-customer` set to true. Keep `email`, `first-name` and `last-name`.

**Step 3: Check each against the audience**

For each customer, call `mailchimp-get-list-member` with `email` set to the customer's email and `list-name` set to the audience name. Classify:

* **Already a member:** any status, including unsubscribed, cleaned and pending. Skip.
* **To add:** no row.

**Step 4: Confirm**

Show the to-add list (email, first name, last name), the counts skipped by status, the audience and the status that will be used. State that pending sends each contact a confirmation email. If `{status}` is subscribed, ask the user to confirm that these customers gave marketing consent at checkout; if they do not confirm, use pending. Wait for an explicit yes before writing anything.

**Step 5: Add the members**

For each confirmed customer, call `mailchimp-add-list-member` once with `list-id`, `email-address`, `status`, `first-name` and `last-name`. Record each success or error and continue past failures.

**Step 6: Report**

Counts added, skipped and failed, the failures with the error text, and a reminder of the status used.

**Rules & Guidelines:**

* `woocommerce-get-customer` is on the woocommerce server. `mailchimp-get-list`, `mailchimp-get-list-member` and `mailchimp-add-list-member` are on the mailchimp server.
* `mailchimp-add-list-member` is the only write tool this prompt may call, once per confirmed customer, after Step 4. Never call `mailchimp-update-list-member`: never resubscribe a contact who unsubscribed or was cleaned. Do not call any woocommerce add or update tool.

**Validation:**

* Match on email, compared case-insensitively. Skip customers with no email.
* `{status}` must be pending or subscribed. Anything else: stop and ask.
* If no customers need adding, say so and stop without asking for confirmation.