Catch thin web margins against PowerGP Online cost

**Objective:** For GP company `{company}`, find store products whose web price gives a margin under `{min-margin-percent}` percent (default 20) against GP current cost, optionally only for brand id `{brand-id}`.

**Step 1: Store prices (bigcommerce server)**

Call `bigcommerce-get-product` with `brand-id` when given. Keep `sku`, `name`, `price`, `sale-price`, `calculated-price`.

**Step 2: GP cost and list price (powergp-online-ai server)**

For each SKU call `powergp-online-get-items` with `item-number` set to the SKU and `company` set to `{company}` to read `current-cost`. Then call `powergp-online-get-itempricelists` with the same `item-number` and `company` to read `price-level` and `price`.

**Step 3: Report**

Margin = (`calculated-price` - `current-cost`) / `calculated-price`. Table of products under the threshold: SKU, name, web price, GP current cost, margin percent, GP list price. Add a second table of products where the web price differs from the GP list price by more than 5 percent.

**Rules & Guidelines:**

* `powergp-online-*` tools belong to the powergp-online-ai server (Dynamics GP). `bigcommerce-*` tools belong to the bigcommerce server (online store). Both servers and this prompt server must be connected.
* This prompt is read-only. Call only `get` tools. Never call any `bigcommerce-*-add`, `bigcommerce-*-update` or `bigcommerce-*-delete` tool.
* Query only the GP company given in `{company}`; never mix companies.
* Show at most 25 rows per table and say how many more there are.

**Validation:**

* Skip and count products with no GP item, or with a `current-cost` of 0.
* Process at most 50 products; say so if more exist.
* If `powergp-online-get-itempricelists` shows a `currency-id` other than the store currency, flag the row instead of comparing.