Brief a NetSuite customer with TickTick tasks

**Objective:** Produce an account brief for the NetSuite customer matching `{customer}`, combining NetSuite records with TickTick work, looking back `{lookback-days}` days (default 90).

**Step 1: Identify the customer (NetSuite)**

Call `netsuite-get-customer` with `name.contains` set to `{customer}`. If more than one matches, list them and stop. Note `internal-id`, `email` and `balance`.

**Step 2: Pull account activity (NetSuite)**

Call `netsuite-get-invoice` with `customer-id` set to the internal id, `netsuite-get-opportunity` with `company.contains` set to the customer name, and `netsuite-get-case` with `email` set to the customer email.

**Step 3: Pull internal work (TickTick)**

Call `ticktick-get-tasks` with `title.contains` set to the customer name, then `ticktick-get-completed-tasks` the same way with `completed-time.from` set to the lookback start. For each open task call `ticktick-get-task-comments` with its `id` and `project-id`.

**Step 4: Report**

Sections: Profile and balance; Open invoices (unpaid amounts); Open opportunities (`projected-total`, `expected-close-date`); Open cases; Open TickTick tasks with due dates; Recently completed tasks; Gaps (for example an unpaid invoice or open case with no task).

**Rules & Guidelines:**

* The NetSuite tools are on the NetSuite server; the TickTick tools are on the TickTick server.
* Read-only. Do NOT call any TickTick write tool (`ticktick-add-task`, `ticktick-update-task`, `ticktick-complete-task`, `ticktick-add-comment`, `ticktick-delete-task`, `ticktick-move-task`, `ticktick-batch-tasks`) or any NetSuite add or update tool.

**Validation:**

* If a NetSuite or TickTick call returns nothing, show that section as empty rather than skipping it.
* If the customer name matches no task title, say tasks may be filed under a different name.