Post Shopify payments against the right Rillet invoices

**Objective:** Record each successful Shopify payment processed from `{from-date}` to `{to-date}` (default: yesterday) against the matching open Rillet invoice, posting to the Rillet account `{clearing-account-code}`, after the user confirms.

**Step 1: Read the Shopify payments**

Call `shopify-get-transaction` with processed-at.from and processed-at.to set to the range. Keep only transactions whose kind is a sale or a capture and whose status is success (check the tool schema for the exact values). Note order-transaction-id, order-number, order-id, processed-at, shop-amount, currency and gateway.

**Step 2: Find the Rillet invoices**

Call `rillet-get-invoices` (it takes no filters). For each transaction, find the invoice whose invoice-number equals the Shopify order name. Try the order number with and without a leading #.

Sort each transaction into one group:

* ready: invoice found, amount-due greater than 0, same currency
* no invoice: nothing matched. Suggest running backfill-shopify-orders first.
* already paid: amount-due is 0
* over amount: shop-amount is more than amount-due. Do not post these. Report both amounts.
* currency mismatch: report both currencies

**Step 3: Check the account**

Call `rillet-get-accounts` filtered by account-code `{clearing-account-code}`. If it does not exist, or its status is not active, stop and say so.

**Step 4: Confirm**

Show the ready group: order number, invoice-number, payment date, amount, currency, gateway, amount-due before and after. Show the other groups below it. Ask the user to confirm. Post nothing until they do.

**Step 5: Post and report**

For each confirmed payment, call `rillet-add-invoice-payment` once with invoice-id, date (the processed-at date), amount (shop-amount), currency and account-code `{clearing-account-code}`.

Report the payments posted with the returned id, any that failed with the error as returned, and the other groups.

**Rules & Guidelines:**

* `shopify-get-transaction` is on the shopify server. `rillet-get-invoices`, `rillet-get-accounts` and `rillet-add-invoice-payment` are on the rillet server.
* `rillet-add-invoice-payment` is the only write tool this prompt may call, once per confirmed payment. Do not call `rillet-update-invoice-payment`, `rillet-update-invoice` or any shopify write tool.
* Several transactions on one order post as separate payments, in processed-at order. Stop posting on that invoice when amount-due reaches 0.

**Validation:**

* If Shopify returns no qualifying transactions, say so and stop.
* Before posting, call `rillet-get-invoice-payments` and skip any transaction that already has a payment on the same invoice-id with the same date and amount. Report these as possibly already recorded.
* If the user does not confirm, post nothing.