Rebuild a Drip segment as a Constant Contact list

**Objective:** Build a Constant Contact list from a Drip audience. Take active Drip subscribers whose tags include `{tag}` and, after confirmation, create the ones Constant Contact lacks as contacts on the list named `{list-name}`.

**Step 1: Read the audience from Drip**

Call `drip-get-subscriber` with `tags.contains` set to `{tag}` and `status` set to active. Note `email`, `first-name`, `last-name` and `phone-number`.

**Step 2: Find the target list**

Call `constant-contact-get-contact-list` with `name` set to `{list-name}`. If there is no exact match, list near matches from `name.contains` and stop so the user can pick or create the list first. Note its `list-id`.

**Step 3: Check each person against Constant Contact**

For each Drip person, call `constant-contact-get-contact` with `email-address` set to their `email`. Split into: already in Constant Contact (note `permission-to-send`) and missing.

**Step 4: Confirm**

Show the counts (tagged in Drip, already in Constant Contact, missing) and a table of the missing people. Ask: "Create these N contacts in Constant Contact on the list?" Do nothing until the user says yes.

**Step 5: Write and confirm**

For each confirmed person, call `constant-contact-add-contact` once with `email`, `first-name`, `last-name`, `phone` from Drip and `list-id` set to the list's id. Leave `permission-to-send` unset unless the user tells you how these people opted in. Re-read each with `constant-contact-get-contact` and confirm the contact exists.

**Step 6: Report**

A table: email, result (created, already in Constant Contact, failed). List separately the people already in Constant Contact, since this prompt does not add existing contacts to the list.

**Rules & Guidelines:**

* `drip-get-subscriber` is on the drip server. `constant-contact-get-contact-list`, `constant-contact-get-contact` and `constant-contact-add-contact` are on the constant-contact server.
* The only write allowed is `constant-contact-add-contact`, after Step 4, and only for people missing from Constant Contact.
* Never touch a contact Constant Contact already has, and never set `permission-to-send` to explicit unless the user confirms these people opted in directly.
* Do NOT call `constant-contact-update-contact`, `constant-contact-add-contact-list` or any drip- action.

**Validation:**

* If no active Drip subscriber has the tag, say so and stop.
* If everyone is already in Constant Contact, say so and stop without writing.
* Skip anyone with a blank email and list them as skipped.