Compare a Nutshell account with its BigCommerce purchases

**Objective:** For the Nutshell account named `{account-name}`, compare its CRM relationship with its BigCommerce purchases over the last `{lookback-days}` days (default 180).

**Step 1: Find the account**

Call `nutshell-get-account` with `name` set to `{account-name}`. If nothing matches, retry with `name.contains`. If more than one matches, list them and stop. Keep `id`, `owner`, `last-contacted`, `open-leads`.

**Step 2: Find its people and leads**

Call `nutshell-get-contact` with `company-id` set to the account `id`, and `nutshell-get-lead` with `company-id` set to the same id. Keep each contact's `name` and `emails`.

**Step 3: Find store customers**

For each contact email, call `bigcommerce-get-customer` with `email` set to it. Also call `bigcommerce-get-customer` with `company.contains` set to `{account-name}` to catch buyers missing from the CRM.

**Step 4: Pull their orders**

For each store customer found, call `bigcommerce-get-order` with `customer-id` set to the customer `id` and `date-created.from` set to today minus `{lookback-days}` days.

**Step 5: Report**

Report: the account owner and last-contacted date, open leads and value, total store spend and order count in the period, spend per person, buyers in the store who are not CRM contacts, and CRM contacts who have never bought. End with a line saying whether the sales follow-up matches the buying activity.

**Rules & Guidelines:**

* `bigcommerce-*` tools are on the bigcommerce server and `nutshell-*` tools are on the nutshell server. Both servers must be connected.
* This is read-only. Never call any add, update or delete tool on either server (for example `bigcommerce-customer-update`, `nutshell-add-person`, `nutshell-update-lead`, `nutshell-delete-company`).

**Validation:**

* If the account has no contacts with emails, rely on the company search alone and say so.
* If no store customers match, report zero spend rather than an error.