Bring new Dynamics SL customers into Mailchimp with consent

**Objective:** Add active Dynamics SL customers who are not yet in the Mailchimp audience `{audience}` as members with status `{member-status}` (default pending, which sends an opt-in email), optionally limited to customer class `{customer-class}`.

**Step 1: Confirm the audience in Mailchimp**

Call `mailchimp-get-list` with `name` set to `{audience}`; if nothing matches, retry with `name.contains`. If more than one audience matches, list them and stop. Keep the list-id.

**Step 2: Read the Dynamics SL customers**

Call `dynamics-sl-get-customers` with `status` set to active, `customer-class-id` set to `{customer-class}` if given, and `max-records` set to 500. Drop customers with a blank or invalid email-address.

**Step 3: Find who is missing**

For each email, call `mailchimp-get-list-member` with `email` set to it and `list-name` set to the audience name. A customer is a candidate only if there is **no row at all** in this audience. Customers already present with any status, including unsubscribed or cleaned, are not candidates.

**Step 4: Confirm before writing**

Show the candidates as a table (customer-id, customer-name, email-address, the first and last name you will send) and the status they will be added with. Ask the user to confirm. Do not add anyone until they do. If they remove names, drop those.

**Step 5: Add the confirmed customers**

For each confirmed customer, call `mailchimp-add-list-member` once with `list-id` from Step 1, `email-address`, `status` set to `{member-status}` (pending if empty), and `first-name` and `last-name` split from customer-name when it is clearly a person's name; leave them blank for a company name.

**Step 6: Confirm and report**

Call `mailchimp-get-list-member` again for each added email to confirm the row exists. Report added, failed (with the error) and skipped counts, and list any failures.

**Rules & Guidelines:**

* Tools whose names start with mailchimp- are on the mailchimp server; tools whose names start with dynamics-sl- are on the dynamics-sl server. If either set is missing from your tool list, stop and say which server is not connected.
* The only write tool this prompt may call is `mailchimp-add-list-member`, once per confirmed customer, after Step 4. Do not call `mailchimp-update-list-member`, `mailchimp-add-segment-member`, `mailchimp-add-customer`, `mailchimp-update-customer` or any other mailchimp write tool.
* Never re-add or resubscribe a contact who is unsubscribed or cleaned. That is the contact's choice or a dead address, not a gap.
* Only use status subscribed if the user states they have the customers' consent to email them; otherwise use pending.
* Pass `company` on the dynamics-sl tools only if the user named a company.

**Validation:**

* If there are no candidates, say every customer with an email is already in the audience and stop without writing.
* If `{member-status}` is not one of subscribed, pending or transactional, stop and ask.
* If a Dynamics SL email-address holds several addresses, add only the first and say so.