Bring every active Intacct customer into your Mailchimp audience

**Objective:** Add active Intacct customers that are missing from the Mailchimp audience `{audience}`, with subscription status `{subscription-status}` (default pending, which sends a double opt-in email). Limit to customer type `{customer-type}` if given. Nothing is written until the user confirms.

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

Call `mailchimp-get-list` filtered by `name` = `{audience}` and take its `list-id`. If none or more than one match, list what was found and stop.

Check the subscription status. Allow only pending, subscribed or transactional. If it is subscribed, warn the user that Mailchimp requires these people to have given marketing consent, and ask them to confirm they have it before going further.

**Step 2: List active customers in Intacct**

Call `intacct-get-customer` with `status` = active (and `customer-type` = `{customer-type}` if given). Keep the customers with a non-empty `email`. List the ones without an email separately as "no email on file".

**Step 3: Compare against the audience**

For each customer email, call `mailchimp-get-list-member` filtered by `email` and `list-name` = `{audience}`.

* Not found: a candidate to add.
* Found with any status: skip it. In particular never re-add an address that is unsubscribed or cleaned; list those separately so the user can see them.

For each candidate, call `intacct-get-contact` filtered by `email`. If exactly one contact matches, use its `first-name` and `last-name`. Otherwise leave the names blank; do not split the customer name into a first and last name.

**Step 4: Confirm**

Show the plan as a table: customer-name, customer-id, email, first name, last name, status to set. Show the skipped lists below it. Ask the user to confirm. Do not continue without an explicit yes. If the plan is empty, say the audience already has every customer and stop.

**Step 5: Add**

For each confirmed row, call `mailchimp-add-list-member` with `list-id`, `email-address`, `status` and, where known, `first-name` and `last-name`. Then call `mailchimp-get-list-member` filtered by `email` and `list-name` to confirm. Report each one as added or failed, with the error.

**Rules & Guidelines:**

* `intacct-get-customer` and `intacct-get-contact` are on the intacct server. `mailchimp-get-list`, `mailchimp-get-list-member` and `mailchimp-add-list-member` are on the mailchimp server.
* Match email addresses case-insensitively and after trimming spaces. If an Intacct email field holds several addresses, treat each as a separate candidate.
* The only write allowed is `mailchimp-add-list-member`, and only after confirmation. Do NOT call `mailchimp-update-list-member` (never change an existing member's status), `mailchimp-add-segment-member`, or any create or update tool on the intacct server.

**Validation:**

* If there are more than 100 candidates, show the first 100 and ask whether to continue in batches.
* If an add fails because the address is invalid or was previously removed, report it and continue.