Find every Chorus conversation with a Nutshell contact

**Objective:** Trace the Nutshell contact `{contact-name}` through Chorus and list every recorded conversation they appeared in since `{since-date}` (default: all time).

**Step 1: Find the contact in Nutshell**

Call `nutshell-get-contact` (Nutshell server) with `name.contains` set to `{contact-name}`. If more than one contact matches, list them with id, job-title and company-id and stop. If none match, say so and stop. Take the first value of `emails`; if the contact has no email, report that the contact cannot be matched and stop.

**Step 2: Find them in Chorus**

Call `chorus-get-conversation-participants` (Chorus server) with `email` set to that address. Collect the distinct `conversation-id` values.

**Step 3: Pull the conversations**

For each `conversation-id` (cap at 20) call `chorus-get-engagements` (Chorus server) with `conversation-id` set to it. If `{since-date}` was given, drop engagements dated before it.

**Step 4: Report**

Contact summary (name, job-title, emails, last-contacted, number-of-leads from Nutshell), then a table of conversations: date, subject, conversation-type, account-name, user-name, duration.

**Rules & Guidelines:**

* `nutshell-get-contact` is on the Nutshell server; `chorus-get-conversation-participants` and `chorus-get-engagements` are on the Chorus server.
* Read only. Do not call any add, update, delete or create tool on either server.
* Show contact details only as needed for the match; do not print phone numbers.

**Validation:**

* If Chorus has no participant with that email, report the contact as present in Nutshell and absent from Chorus.
* If the email addresses differ in case, treat them as equal.