Enroll customers with renewals coming up in a Drip campaign

**Objective:** Enroll the contacts of every Rillet customer whose active contract ends within the next `{days-ahead}` days (default 60) in the Drip campaign named `{campaign-name}`.

**Step 1: Find the campaign in Drip**

Call `drip-get-campaign` (Drip) with name set to `{campaign-name}`. If nothing matches, retry with name.contains. If there is still no match, or more than one, list what was found and stop. Note the campaign-id and status; if the campaign is not active, warn the user that enrolled people will not receive emails until it is activated.

**Step 2: Find renewing contracts in Rillet**

Call `rillet-get-contracts` (Rillet) with end-date.from set to today and end-date.to set to today plus `{days-ahead}` days. Keep active contracts. Collect the customer-ids with contract name, end-date and total-value.

**Step 3: Carry across to Drip**

Call `rillet-get-customer-emails` (Rillet) once and attach the emails for each customer-id. For each email:

* Call `drip-get-subscriber` (Drip) with email set to it. Skip anyone whose status is unsubscribed.
* Call `drip-get-campaign-subscriber` (Drip) with email and campaign-id. Skip anyone already subscribed to this campaign.

**Step 4: Confirm**

Show the user: customer name, contract name, end-date, email, and whether the person already exists in Drip. Ask for explicit confirmation before writing.

**Step 5: Write**

For each confirmed email, call `drip-add-subscriber-to-campaign` (Drip) once with campaign_id and email. Then report enrolled, skipped (with the reason) and failed.

**Rules & Guidelines:**

* The only key shared by the two systems is the email address. Rillet emails come from `rillet-get-customer-emails` (one row per address, with its customer-id and email-type); Drip emails come from the email field of `drip-get-subscriber`. Compare them trimmed and lower-cased. Never match on name alone.
* The only tool that may write is `drip-add-subscriber-to-campaign` on Drip, after Step 4. Note that it creates the person in Drip if they are not there yet; say so in the confirmation. Do not call `drip-activate-campaign`, `drip-start-subscriber-workflow`, `drip-add-subscriber` or `drip-update-subscriber`.
* Never call any Rillet tool whose name starts with rillet-add, rillet-update, rillet-apply, rillet-unapply, rillet-record, rillet-set or rillet-setup. Rillet is read-only in this prompt.

**Validation:**

* If no contracts end in the window, say so and stop.
* If a renewing customer has no email in Rillet, list them under "no email on file".
* If the user does not confirm, stop and write nothing.