Rank your open Nutshell leads by email engagement

**Objective:** For the open Nutshell leads owned by `{owner}` (default: all owners), rank the people attached to them by Constant Contact email engagement over the last `{lookback-days}` days (default 60), so sellers know who is warm.

**Step 1: Get the open leads**

Call `nutshell-get-lead` (Nutshell server) with `status` set to open, `owner.contains` set to the owner if given, and `max-records` 20. Keep `id`, `name`, `value`, `anticipated-close-time` and `people`.

**Step 2: Get the people's emails**

For each person on the leads call `nutshell-get-contact` with `name` set to that person to get `emails`. Skip people with no email and list them as unreachable.

**Step 3: Look up engagement**

For each email call `constant-contact-get-contact` (Constant Contact server) with `email-address`. Then call `constant-contact-get-campaign-open` and `constant-contact-get-campaign-click` with the `contact-id` and `created-date.from` set to the start of the window. Count opens and clicks.

**Step 4: Report**

A table per lead: lead name, value, expected close, then each person with opens, clicks and last activity. Order leads by engagement, highest first. Finish with the three leads where engagement is high and a call is the obvious next step, and the three high-value leads with no engagement at all.

**Rules & Guidelines:**

* Nutshell tools (`nutshell-*`) are on the Nutshell server; `constant-contact-*` tools are on the Constant Contact server.
* Read-only. Never call `nutshell-update-lead`, `nutshell-add-activity` or any Constant Contact add or update tool.

**Validation:**

* A person not found in Constant Contact is reported as not in email marketing, not as zero engagement.
* If there are no open leads, say so and stop.