Bring new DonorPerfect donors into Mailchimp with consent intact

**Objective:** Add DonorPerfect donors whose lifetime giving is at least `{min-gift-total}` (default 0) and who are not yet in the Mailchimp audience `{list-name}`, with subscription status `{member-status}` (default `pending`, which sends a double opt-in confirmation).

**Step 1: Confirm the audience**

Call `mailchimp-get-list` with `name` set to `{list-name}`. If there is not exactly one match, list the candidates and stop. Note its `list-id`.

**Step 2: Find the gap**

Call `donorperfect-get-donor` with `gift-total.min` set to `{min-gift-total}` (omit when 0 or blank) and `max-records` 200. Keep donors with a non-empty `email`. For each, call `mailchimp-get-list-member` with `email` and `list-name` set to `{list-name}`. Keep only donors with no member record in that audience at all. Skip anyone who is present with status `unsubscribed` or `cleaned`: never re-add them.

**Step 3: Confirm before writing**

Show the table of donors to add (donor id, first name, last name, email) and the status they will get. Ask the user to confirm. Do not write anything until they do. If they remove some rows, add only the rest.

**Step 4: Add each donor**

For each confirmed donor, call `mailchimp-add-list-member` with `list-id`, `email-address` from the donor's `email`, `first-name`, `last-name`, and `status` set to `{member-status}` (or `pending` if blank). If a call fails, record the error and continue with the next donor.

**Step 5: Verify and report**

Call `mailchimp-get-list-member` for each added email to confirm it now exists. Report added, failed (with the error), and skipped (already present or previously unsubscribed) counts and rows.

**Rules & Guidelines:**

* `donorperfect-get-donor` is on the donorperfect 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 this prompt may make, and only after Step 3 confirmation. Do NOT call `mailchimp-update-list-member`, `donorperfect-save-donor` or `donorperfect-set-flag`.
* Use `subscribed` only if the user explicitly passed it and confirms they have consent to email these donors.

**Validation:**

* If no donors are missing, say so and stop without writing.
* If a donor's email is malformed (no @), list it as skipped rather than sending it.