Make Dynamics SL customers reachable in Constant Contact

**Objective:** Find Dynamics SL customers (state `{state}` when given, otherwise all active customers, up to 200) who have an email address but no Constant Contact contact, and create them in Constant Contact, optionally adding them to contact list `{list-name}`. Nothing is created until the user confirms.

**Step 1: Candidates from Dynamics SL**

Call `dynamics-sl-get-customers` with `status` active, `state` = `{state}` when provided, and `max-records` 200. Drop customers with a blank `email-address`. If a field holds several addresses, use the first.

**Step 2: Remove those already in Constant Contact**

For each remaining customer, call `constant-contact-get-contact` with the email as `email-address`. Drop every customer that returns a contact, whatever its permission status.

**Step 3: Resolve the target list**

If `{list-name}` is given, call `constant-contact-get-contact-list` with `name` = `{list-name}` and take its `list-id`. If no list has that name, stop and ask whether to create it; create it with `constant-contact-add-contact-list` only after the user says yes.

**Step 4: Confirm**

Show the candidates as a table (customer id, name, email, phone, the list they will join) and ask the user to confirm, or to remove rows. Do not create anything until they reply yes.

**Step 5: Create**

For each confirmed customer, call `constant-contact-add-contact` once with `email`, `company-name` = the SL customer name, `phone` = the SL phone number, and `list-id` when there is one. Leave `permission-to-send` unset unless the user explicitly says these customers have opted in to marketing email.

**Step 6: Confirm and report**

Call `constant-contact-get-contact` with each email to confirm it now exists. Report created, already existing (skipped in Step 2), and failed, with the error for each failure.

**Rules & Guidelines:**

* `dynamics-sl-get-customers` is on the dynamics-sl server and is only read. Every write is on the constant-contact server.
* The only write tools this prompt may call are `constant-contact-add-contact` and, with explicit permission, `constant-contact-add-contact-list`. Do not call `constant-contact-update-contact` on contacts that already exist.
* Do not retry a failed create more than once.
* If the user has named a Dynamics SL company, pass it as `company` on every dynamics-sl call.

**Validation:**

* If every customer is already in Constant Contact, say so and stop.
* If two customers share one email, create one contact and say which customers share it.