Stop Mailchimp counting revenue you refunded in WooCommerce

**Objective:** For WooCommerce orders refunded in full or cancelled in the last `{days-back}` days (default 7), set the matching Mailchimp store order's financial status to refunded or cancelled, after the user confirms, so Mailchimp stops counting that revenue.

**Step 1: Find the WooCommerce store in Mailchimp**

Call `mailchimp-get-store` with `platform` set to WooCommerce and note its `store-id`. If none comes back, report that no WooCommerce store is connected and stop. If several come back, list them and stop unless the user names one.

**Step 2: Read refunds and cancellations in WooCommerce**

Work out the start date as today minus `{days-back}` days. Call `woocommerce-get-refund` with `created-date.from` set to that date, and total the refunded `amount` per `order-id`. An order is **fully refunded** when that total equals its `order-total` within 0.01, and **partly refunded** otherwise. Then call `woocommerce-get-order` with `status` set to cancelled and `created-date.from` set to the same date for cancellations.

**Step 3: Confirm each order exists in Mailchimp**

For each fully refunded or cancelled order, call `mailchimp-get-order-line` with `order-id` set to the WooCommerce `order-id`, keeping rows on the Step 1 store. If nothing comes back, report the order as not in Mailchimp and skip it.

**Step 4: Confirm**

List the planned changes: WooCommerce order number, customer email, amount, and the new Mailchimp financial status (refunded or cancelled). List partly refunded orders separately as not being changed. Warn that Mailchimp may send order notification emails when the financial status changes. Wait for an explicit yes.

**Step 5: Update Mailchimp**

For each confirmed order, call `mailchimp-update-order` once with `store-id`, `order-id` and `financial-status` set to refunded or cancelled, and nothing else. Record each success or error and continue past failures.

**Step 6: Report**

Counts updated, skipped as not in Mailchimp, left alone as partial refunds, and failed, with the failures and their error text.

**Rules & Guidelines:**

* `woocommerce-get-refund` and `woocommerce-get-order` are on the woocommerce server. `mailchimp-get-store`, `mailchimp-get-order-line` and `mailchimp-update-order` are on the mailchimp server.
* `mailchimp-update-order` is the only write tool this prompt may call, after Step 4, and only to set `financial-status`. Do not change fulfilment or tracking. WooCommerce is the source of truth: never call `woocommerce-update-order`, `woocommerce-add-refund` or `woocommerce-add-order-note`.

**Validation:**

* Match on order id. Do not match on email or amount.
* Never mark a partly refunded order as refunded.
* If there are no full refunds or cancellations in the window, say so and stop.