Find overlapping and expiring AvaTax tax rules

**Objective:** Review the custom tax rules for `{company}`, for `{region}` if given, as of today.

**Step 1: Read the rules**

Call `avalara-avatax-get-tax-rule` with `company` and `region` when provided. Read `tax-rule-type`, `tax-code`, `jurisdiction-name`, `tax-type-group`, `value`, `threshold`, `cap`, `effective-date` and `end-date`.

**Step 2: Resolve tax codes**

For each distinct `tax-code` that appears, call `avalara-avatax-get-tax-code` with `tax-code` set to it to get its `description` and whether it is `active`.

**Step 3: Assess**

* Rules whose `end-date` is in the past (ended) or within 60 days (ending).
* Rules not yet effective.
* Two rules for the same jurisdiction, tax code and tax type group with overlapping dates.
* Rules with no `tax-code` (they apply to everything in the jurisdiction) or with a `value` of 0.
* Rules pointing at an inactive tax code.

**Step 4: Report**

Group by status (active, ending, ended, future) and list the flagged rules with the reason. Add a one-line plain explanation of each rule type present.

**Validation:**

* If there are no rules, say that only standard AvaTax calculation applies.

**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.