Find top BigCommerce customers who are not engaged in Drip

**Objective:** Rank the top `{top-n}` customers by spend over the last `{lookback-days}` days (default 365; top-n defaults to 20) and show how each one is engaged in Drip.

**Step 1: Get orders and rank**

Call `bigcommerce-get-order` (bigcommerce server) with `date-created.from` set to the start of the window. Total `total-including-tax` by `customer-id`, ignore guest orders (`customer-id` 0), and keep the top `{top-n}`.

**Step 2: Get customer details**

Call `bigcommerce-get-customer` (bigcommerce server) with `id` for each. Keep `email`, name and `company`.

**Step 3: Look each one up in Drip**

Call `drip-get-subscriber` (drip server) with `email`. Keep `status`, `lead-score`, `tags`, `lifetime-value`. Then call `drip-get-campaign-subscriber` (drip server) with `email` and count campaigns with a `campaign-status` of active.

**Step 4: Report**

A ranked table: rank, name, email, orders, spend, Drip status, lead score, active campaigns. Mark each row Not in Drip, Not active, No campaigns or Engaged. Finish with the counts of each mark.

**Rules & Guidelines:**

* `bigcommerce-get-customer`, `bigcommerce-get-order`, `bigcommerce-get-subscriber` are on the bigcommerce server. `drip-get-subscriber`, `drip-get-campaign-subscriber` are on the drip server.
* This prompt only reads. Never call any `bigcommerce-customer-add`, `bigcommerce-customer-update`, `bigcommerce-subscriber-add` or other bigcommerce add, update or delete tool, and never call `drip-add-subscriber`, `drip-update-subscriber`, `drip-add-subscriber-tag`, `drip-remove-subscriber-tag`, `drip-unsubscribe-subscriber` or any other Drip write tool.
* Match people across the two systems on email address, compared case-insensitively after trimming spaces. Drip `person-id` and BigCommerce `id` are unrelated and must not be compared.
* If the user supplied a Drip account, pass it as `company` on every Drip call; otherwise omit `company`.

**Validation:**

* If there are no orders in the window, say so and stop.
* A customer with no email is shown with Drip columns marked Unknown.