Get a tax summary by period from AvaTax in one question

**Objective:** Summarise tax activity from `{date-from}` to `{date-to}` for `{company}` (all if omitted), and for `{region}` if given.

**Step 1: Read the transactions**

Call `avalara-avatax-get-transaction` with `date.from`, `date.to`, and `company` and `region` when provided. Read `document-type`, `status`, `region`, `country`, `total-amount`, `total-taxable`, `total-exempt`, `total-discount`, `total-tax`, `currency-code`.

**Step 2: Aggregate**

* Totals per `region` and per `document-type` (sales, returns and others as they appear).
* Totals per `status` so uncommitted amounts are visible.
* Effective tax rate per region (`total-tax` divided by `total-taxable`).
* Keep currencies separate when more than one `currency-code` appears.

**Step 3: Report**

A summary table per region, a short table by status, the top five regions by tax, and a note listing anything not Committed that would not yet be in filing. State the number of transactions read and whether `max-records` may have cut it short.

**Validation:**

* If the date range is invalid, ask for a valid one and stop.
* If no transactions return, say so.

**Rules & Guidelines:**

* This prompt is read-only. Call only the `avalara-avatax-get-*` tools named above. Never call any avalara-avatax tool that adds, updates, deletes, commits, uncommits, voids, unvoids, adjusts, refunds, locks, settles or creates anything.
* Report what the data shows. Do not guess values the tools did not return, and say so when a field came back empty.
* Use `max-records` to keep each read small, and say when a result may be truncated by it.