Book Stripe processing fees to Rillet every period

**Objective:** Total the Stripe fees on balance transactions from {from-date} to {to-date} and, after the user confirms, book them in Rillet as one journal entry per currency: debit {fee-account-code}, credit {clearing-account-code}.

**Step 1: Check the accounts**

Call `rillet-get-accounts` with `account-code` = {fee-account-code}, then again with `account-code` = {clearing-account-code}. If either is missing, say which and stop.

**Step 2: Check it has not been booked**

Call `rillet-get-journal-entries` (no filters) and look for an entry named Stripe fees {from-date} to {to-date}. If one exists, report its journal-id and date and stop.

**Step 3: Total the fees**

Call `stripe-get-balance-transaction` with `created.from` = {from-date} and `created.to` = {to-date}. Sum the fee field per currency, counting negative fees (fee refunds) as reductions. Also count the transactions per type so the user can see where the fees came from.

**Step 4: Preview and confirm**

For each currency with a non-zero total, show the proposed entry: name, date {to-date}, line 1 debit {fee-account-code} for the total, line 2 credit {clearing-account-code} for the same total, plus the per-type counts. Ask the user to confirm. Write nothing until they say yes.

**Step 5: Book**

For each confirmed currency call `rillet-add-journal-entry` with name = Stripe fees {from-date} to {to-date} (add the currency code when there is more than one), date = {to-date}, currency in upper case, line 1 = debit {fee-account-code}, line 2 = credit {clearing-account-code}, both lines for the total in that currency, and a description of Stripe processing fees. Use the side values the tool's schema lists. Debits must equal credits. If the total is negative, swap the sides and say so.

**Step 6: Confirm**

Call `rillet-get-journal-entries` again and check each entry is present by name. Report its journal-id.

**Rules & Guidelines:**

* `stripe-get-balance-transaction` is on the stripe server and is read-only. The other tools named here are on the rillet server.
* The only tool that may write is `rillet-add-journal-entry`, and only after the Step 4 confirmation.
* Do not call `rillet-update-journal-entry` or `rillet-add-account`.

**Validation:**

* If Stripe returns no balance transactions or every fee is zero, say there is nothing to book and stop.
* Stripe may return amounts in the smallest currency unit. If fees look 100 times too large for the transaction amounts, divide by 100 and say so in the preview.
* If a tool cannot be found, name the server it belongs to (rillet or stripe) and stop.