Get every Rillet customer onto your Constant Contact list

**Objective:** Make sure every Rillet customer email (optionally only customers whose name contains `{customer-name-contains}`) exists in Constant Contact, adding the missing ones to the list named `{list-name}` only after the user confirms.

**Step 1: Resolve the target list**

Call `constant-contact-get-contact-list` (constant-contact server) with `name` set to `{list-name}`. If nothing comes back, retry with `name.contains`. If several lists match, show them with `name`, `list-id` and `active-members` and ask which to use. If none match, say so and stop: this prompt does not create lists.

**Step 2: Read customer emails from Rillet**

Call `rillet-get-customer-emails` (rillet server). If `{customer-name-contains}` is given, keep rows whose `name` contains it, ignoring case. Remove duplicate emails.

**Step 3: Find the gap**

For each email, call `constant-contact-get-contact` (constant-contact server) with `email-address`. Sort each email into one of:

* **Missing:** no contact found. These are the candidates to add.
* **Present:** contact found. Do not change it.

**Step 4: Confirm**

Show a table of the Missing emails with the Rillet customer `name`, `customer-id` and `email-type`, and the count of Present emails. Ask the user to confirm adding the Missing contacts to the chosen list, and to confirm whether these people have given permission to receive marketing email. Do not continue without an explicit yes.

**Step 5: Add the contacts**

For each confirmed email, call `constant-contact-add-contact` (constant-contact server) once with `email`, `list-id` from Step 1, and `company-name` set to the Rillet customer name. Set `permission-to-send` only to the value the user confirmed in Step 4; if they did not confirm consent, leave it unset. Then call `constant-contact-get-contact` with `email-address` to confirm each one exists.

**Step 6: Report**

Counts of Present, Added and Failed, and a table of any failures with the error returned.

**Rules & Guidelines:**

* Tools starting rillet- are on the rillet server; tools starting constant-contact- are on the constant-contact server.
* `constant-contact-add-contact` is the only tool that may write, and only after the confirmation in Step 4. Call it once per email and never retry a call that returned an error without asking.
* Do not call `constant-contact-update-contact`, `constant-contact-add-contact-list`, `constant-contact-add-contact-tag` or any other constant-contact-add-* or constant-contact-update-* tool, and do not call any rillet-add-* or rillet-update-* tool. Rillet is read-only here.

**Validation:**

* If nothing is Missing, say every customer email is already in Constant Contact and stop.
* Skip rows whose email is blank or not a valid address, and list them as skipped.