Create the missing Business Central customer from Chargebee

**Objective:** Make sure the Chargebee customer `{customer-email}` exists in Business Central, creating it only after the user confirms.

**Step 1: Read Chargebee**

Call `chargebee-get-customer` (Chargebee server) with `email` set to `{customer-email}`. If there is not exactly one result, list what was found and stop. Keep `company`, `first-name`, `last-name`, `email`, `phone`, `preferred-currency` and `id`.

**Step 2: Check Business Central thoroughly**

Call `business-central-get-customer` (Business Central server) with `email` set to the customer's email. Then call it again with `name.contains` set to the company (or last name when company is empty). If any customer is found, show it and stop: do not create a duplicate.

**Step 3: Confirm**

Show the proposed Business Central customer: display name (company, else first and last name), email, phone, currency. Ask the user to reply "yes" to create it. Do not proceed without an explicit yes.

**Step 4: Create and verify**

Only after confirmation, call `business-central-create-customer` (Business Central server) once, with `display-name`, `email`, `phone-number` and `currency-code` from Step 1, plus `company` when `{company}` is given. Then call `business-central-get-customer` with the new `number` as `customer-number` to confirm it exists, and report the new customer number.

**Rules & Guidelines:**

* `chargebee-get-customer` is on the Chargebee server; the other Business Central tools named here are on the Business Central server.
* The only write allowed is one `business-central-create-customer` call, after confirmation. Never call any Business Central update tool, and never write to Chargebee.
* Create at most one customer per run.

**Validation:**

* If the create call fails, report the error and do not retry.
* Do not set `credit-limit` or payment terms; leave them for the finance team.