See how well your Mailchimp audience covers Rillet customers

**Objective:** Show how well the Mailchimp audience `{list-name}` covers the contacts on Rillet customers, and list the gaps.

**Step 1: Confirm the audience**

Call `mailchimp-get-list` with `name.contains` set to `{list-name}`. If exactly one audience matches, note its `name`, `list-id` and `number-of-members`. If several match, list them and stop so the user can choose; if none match, say so and stop.

**Step 2: Read both sides in full**

* Call `rillet-get-customer-emails` (no filters) to get every Rillet customer email with its `customer-id` and `name`.
* Call `mailchimp-get-list-member` with `list-name` set to the confirmed audience name and `max-records` large enough to cover `number-of-members` from Step 1. Keep `email`, `status` and `last-changed-date`.

Do not call the member tool once per email; compare the two sets in memory. Match emails case-insensitively after trimming spaces. A Rillet customer can have several emails (`email-type`), and one email can appear on more than one Rillet customer: keep every pairing and say so in the report.

**Step 3: Report**

1. Totals: Rillet customer emails, audience members, and how many Rillet emails are in the audience.
2. **Missing from the audience:** Rillet emails with no member row. Table: email, Rillet customer name, `customer-id`.
3. **In the audience but not reachable:** members whose `status` is unsubscribed or cleaned. Table: email, customer name, status, `last-changed-date`.
4. **Pending:** members still awaiting opt-in.
5. Optional one line: how many audience members are not on any Rillet customer (count only, do not list them).

**Rules & Guidelines:**

* Tools named mailchimp- come from the mailchimp MCP server; tools named rillet- come from the rillet MCP server. If a tool from either server is missing, stop and say which server is not connected rather than working around it.
* The only key shared by the two systems is the email address. Mailchimp `customer-id` values (e-commerce store customers) are NOT Rillet customer ids; never pass one system's id into the other.
* Read-only. Do not call any Mailchimp tool whose name starts with mailchimp-add-, mailchimp-update-, mailchimp-start-, mailchimp-pause- or mailchimp-replicate-, and do not call any Rillet tool whose name starts with rillet-add-, rillet-update-, rillet-apply-, rillet-unapply-, rillet-record-, rillet-set- or rillet-setup-. In particular never call `mailchimp-add-list-member`, `mailchimp-update-list-member` or `mailchimp-add-segment-member` from this prompt.
* This prompt only reports. Adding people is a separate prompt (`add-customers-to-audience`), and unsubscribed or cleaned contacts must never be re-added.

**Validation:**

* If `rillet-get-customer-emails` returns nothing, say there are no customer emails in Rillet and stop.
* If the member read returns fewer rows than `number-of-members`, say the comparison is partial and how many rows were read.