Add opted-in Shopify customers to Mailchimp without breaking consent

**Objective:** Find Shopify customers created on or after `{customer-created-from}` (default: 30 days before today) who accept marketing but are not on the Mailchimp audience named `{list-name}`, and after confirmation add them with status `{subscribe-status}` (default pending, which sends a double opt-in email).

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

Call `mailchimp-get-list` with `name` = `{list-name}`. If it does not match exactly one audience, list the matches and stop. Note `list-id`.

**Step 2: Candidate customers from Shopify**

Call `shopify-get-customer` with `created-at.from` = `{customer-created-from}` and `max-records` = 250. Keep only customers whose `accepts-marketing` is true and who have an `email`. Note `first-name` and `last-name`.

**Step 3: Check each against Mailchimp**

For each candidate, call `mailchimp-get-list-member` with `email` and `list-name` = `{list-name}`.

* No member: a candidate to add.
* Member with any status (subscribed, pending, unsubscribed, cleaned, archived): leave alone. Never re-add someone who unsubscribed or was cleaned; list them separately as "consent withdrawn in Mailchimp".

Also call `mailchimp-get-campaign-unsubscribe` with `email` for each candidate; anyone who appears there is not a candidate, even if they are absent from this audience.

**Step 4: Confirm**

Show a table of the people to add (name, email, Shopify customer since) and the status they will be given. Ask the user to confirm. Do not continue without an explicit yes. If the user removes people, drop them.

**Step 5: Add**

For each confirmed person, call `mailchimp-add-list-member` once with `list-id` from Step 1, `email-address`, `status` = `{subscribe-status}` (pending if empty), `first-name` and `last-name`. If a call fails, record the error and continue with the next.

**Step 6: Verify and report**

Call `mailchimp-get-list-member` with each added email and `list-name` = `{list-name}` to confirm the member exists. Report added, failed (with the error), skipped as already present, and skipped for withdrawn consent.

**Rules & Guidelines:**

* `shopify-*` tools are on the shopify server and are read only here; `mailchimp-*` tools are on the mailchimp server.
* The only write tool this prompt may call is `mailchimp-add-list-member`, only in Step 5, only after confirmation. Do NOT call `mailchimp-update-list-member`, `mailchimp-add-customer`, `shopify-update-customer` or any other add or update tool.
* Match on email only, case-insensitive and trimmed.
* Accept only subscribed or pending for `{subscribe-status}`; refuse anything else and stop.

**Validation:**

* If there are no candidates, say the audience is already in step with Shopify and stop.
* If Step 2 returns 250 customers, say the run was capped and suggest a later `{customer-created-from}`.