Find Attio contacts who never joined a Chorus call

**Objective:** For `{company-name}`, find who is in Attio but never on a Chorus call, and who is on Chorus calls but missing from Attio, looking back `{lookback-days}` days (default 180).

**Step 1: Attio people**

Call `attio-get-record-people` (Attio server) with `company` set to the company name. Keep `name`, `job-title` and `email-addresses`. If it returns nothing, call `attio-get-record-companies` (Attio) with `name.contains` to confirm the company exists, report the result and stop.

**Step 2: Chorus participants**

Call `chorus-get-engagements` (Chorus server) with `account-name` set to the company name and `date.from` set to the start of the window, to get the `conversation-id` values. For each, call `chorus-get-conversation-participants` (Chorus) with that `conversation-id`. Keep only participants whose `type` is external (not company users).

**Step 3: Match**

Match Attio to Chorus on email address, compared case-insensitively. Where an email is missing on one side, match on exact full name and mark the match WEAK.

**Step 4: Report**

Three lists: in both (name, title, number of calls), Attio only (silent contacts), Chorus only (candidates to add to Attio, with name, email, company-name, title). Close with the coverage percentage of Attio contacts seen on a call.

**Rules & Guidelines:**

* `attio-*` tools are on the Attio server; `chorus-*` tools are on the Chorus server.
* Read-only. Do not call `attio-add-person`, `attio-upsert-person`, `attio-update-person`, `attio-delete-person` or any other write tool on either server. Suggest additions; do not make them.

**Validation:**

* If Chorus has no conversations for the account, report that and skip the Chorus-only list.
* Never treat an internal Chorus user as a missing contact.