Alert salespeople when a Dynamics SL customer stops reading email

**Objective:** Find contacts who unsubscribed from Mailchimp campaigns in the last `{lookback-days}` days (default 30), match them to Dynamics SL customers by email, and show the business each one still has open.

**Step 1: Read unsubscribes in Mailchimp**

Call `mailchimp-get-campaign-unsubscribe` with `unsubscribe-date.from` set to the start of the window. Keep email, first-name, last-name, company, campaign-name, unsubscribe-date and reason. If there are none, say so and stop.

**Step 2: Match to Dynamics SL customers**

`dynamics-sl-get-customers` cannot filter by email, so call it with `max-records` set to 1000 and match each unsubscribed email to the customer email-address locally. If there is no email match but Mailchimp has a company, try `dynamics-sl-get-customers` with `customer-name.contains` set to that company and report it as a name match, not a confirmed match. Unmatched contacts are reported as not Dynamics SL customers.

**Step 3: Read their open business**

For each matched customer, call `dynamics-sl-get-customer-balances` with `customer-id` for current-balance and total-open-orders, and `dynamics-sl-get-sales-orders` with `customer-id` for orders with an unshipped-balance or balance-due above zero.

**Step 4: Report**

A table of matched customers sorted by current balance: customer-name, salesperson-id, email, unsubscribe-date, campaign-name, reason, current-balance, number of open orders, phone-number. Then counts of matched by email, matched by name only and not customers. Close with which customers most warrant a call from their salesperson and why.

**Rules & Guidelines:**

* Tools whose names start with mailchimp- are on the mailchimp server; tools whose names start with dynamics-sl- are on the dynamics-sl server. If either set is missing from your tool list, stop and say which server is not connected.
* This prompt is read-only. Never call `mailchimp-add-list-member` or `mailchimp-update-list-member` to resubscribe anyone, and do not call any other mailchimp write tool.
* Match email addresses case-insensitively after trimming spaces. A Dynamics SL email-address may hold several addresses; match on any of them.
* Pass `company` on the dynamics-sl tools only if the user named a company.

**Validation:**

* If `{lookback-days}` is empty or not a number, use 30.
* If the customer read returns exactly 1000 rows, say some unsubscribes may be unmatched because the read was capped.