Compare Chargebee products with PowerGP Online items

**Objective:** Compare Chargebee products with PowerGP items for {sku-filter} (a SKU or a text found in names) and report which exist on one side only and which have mismatched descriptions or prices.

**Step 1: Chargebee products**

Call `chargebee-get-product` (chargebee) with `sku` if the filter looks like a SKU, otherwise `name.contains`. Also call `chargebee-get-item-price` (chargebee) with `name.contains` set to the filter to read `price` and `currency-code`. Record `id`, `sku`, `name`.

**Step 2: PowerGP items**

For each product call `powergp-online-get-items` (powergp-online-ai) with `item-number` set to the `sku`. If no SKU, use `item-description.contains` set to the product name. Record `item-number`, `item-description`, `current-cost`. Optionally add `powergp-online-get-itempricelists` with `item-number` to read list prices.

**Step 3: Report**

Three lists: matched, in Chargebee only, in PowerGP only (limit to {max-items} rows, default 25). For matches show the Chargebee price next to the PowerGP price list and cost, and flag a price below `current-cost`.

**Rules & Guidelines:**

* Tools prefixed powergp-online- belong to the powergp-online-ai server; tools prefixed chargebee- belong to the chargebee server. Both servers must be connected.
* Read-only: call only the get tools named above. Never create, change or delete anything in either system.
* Never print card or bank details; report ids, names and amounts only.

**Validation:**

* If a product has no SKU, mark the match as name-based.
* If nothing matches the filter on either side, stop and say so.