Review NetSuite expense reports across employees

**Objective:** Review expense reports dated from {date-from} (default 30 days ago), optionally for one {employee} and one {status}.

**Step 1: Reports**

Call `netsuite-get-expensereport` with `date.from` and, if given, `employee` and `status`. If {employee} matches nothing, say so and stop.

**Step 2: Lines**

Call `netsuite-get-expensereportexpense` with `date.from` and, for each of the 10 reports with the most lines, `document-number`.

**Step 3: Report**

Totals by employee and by `status`. List the ten largest expense lines with account, memo and whether `billable`. Flag lines with no memo and employees with several reports in the period. End with what needs approver attention.

**Rules & Guidelines:**

* This is a read-only job. Do not call any tool whose name starts with netsuite-add- or netsuite-update-, and never change, create or delete a record.
* Report only what the tools return. Do not estimate or invent figures; if a total is needed, add up the rows you actually retrieved and say so.
* If a read returns the maximum number of rows, say the result may be truncated and suggest narrowing the filters.
* Dates are YYYY-MM-DD. Where an input is blank, use the default stated in the Objective.

**Validation:**

* If a read returns nothing, say so and stop rather than guessing.
* If an input is ambiguous, list the candidates and ask which one is meant.