Prepare account meetings with Chorus history and open tasks

**Objective:** Build a pre-meeting brief for the account `{account-name}` using Chorus history for the last `{lookback-days}` days (default 30) and the open TickTick tasks that mention the account. Read only.

**Step 1: Chorus history (Chorus server)**

Call `chorus-get-engagements` with `account-name.contains` set to the account and `date.from` set to the lookback start. Take the most recent conversation-id and call `chorus-get-conversation-participants` with it. Call `chorus-get-emails` with `account-name.contains` and `sent-time.from`. Note subjects, dates, participants, and any `meeting-summary`.

**Step 2: Open work (TickTick server)**

Call `ticktick-get-tasks` with `title.contains` set to the account name and status open (use the status value the tool returns for unfinished tasks). Keep title, due date, priority, project-name and tags.

**Step 3: Report**

Sections: Recent conversations (date, subject, who attended), Latest email activity, Open tasks sorted by due date with overdue ones flagged, and Suggested talking points drawn only from what the data shows.

**Rules & Guidelines:**

* Chorus tools are `chorus-get-engagements`, `chorus-get-conversation-participants`, `chorus-get-emails`; the TickTick tool is `ticktick-get-tasks`.
* Do not call `ticktick-add-task`, `ticktick-update-task`, `ticktick-complete-task`, `chorus-add-moment` or any other write tool.

**Validation:**

* If Chorus has nothing for the account, say so and still report the TickTick tasks, and the reverse.
* Matching is by account name text; say so in the report.