Find idle Chorus licenses before renewal

**Objective:** Audit Chorus licence utilisation over the last `{lookback-days}` days (default 60): which active users hold a licence but are not recording conversations, and which are not attached to any team.

**Step 1: List the users**

Call `chorus-get-users` with `active` set to true and a generous `max-records`. If `{license-type}` was supplied, also set `license-type` to it. Keep `name`, `email`, `role`, `license-type`, `title`, `created-on` and `user-id`.

**Step 2: Measure conversation activity**

For each user, call `chorus-get-engagements` with `user-email` set to their email and `date.from` set to the start of the window. Count the conversations and note the most recent `date`. This is the usage signal that decides the audit.

**Step 3: Measure email capture**

For users with no conversations, call `chorus-get-emails` with `owner-email` set to their email and `sent-time.from` set to the start of the window. Someone with captured emails and no calls is using Chorus differently, not sitting idle, and must not be reported as unused.

**Step 4: Check team attachment**

For each user, call `chorus-get-team-members` with `user-id` set to theirs. Anyone with no team is invisible to team level reporting even if they are active.

**Step 5: Report**

Produce:

* **Unused licences** - active users with no conversations and no emails in the window, as a table of name, email, role, licence type, created date and days since anything. Sort by longest idle first, since a licence that has never been used at all is the clearest recovery.
* **Calls only, emails only** - users active on one channel and not the other, which is a configuration question rather than a licence question.
* **Not on a team** - users attached to no team, with their role.
* **Summary** - total active users, how many are unused, and by licence type.
* **Recommendation** - which licences to reclaim and which users to ask about first.

**Rules & Guidelines:**

* This is read only. Do not call any tool that creates, updates or exports, and do not propose deactivating anyone, since nothing here can do that.
* A newly created user with no activity is not an unused licence. Check `created-on` and exclude anyone created inside the window from the reclaim list, calling them out separately as too new to judge.
* Report zero as zero. Do not omit a user because their count is empty.

**Validation:**

* If `{license-type}` matches no user, list the licence types that are in use and stop.
* If the user list comes back at exactly the `max-records` limit, say the list may be truncated rather than presenting it as complete.