Resend a Constant Contact campaign to non-openers, with a new subject

**Objective:** Schedule a resend of the campaign `{campaign-name}` to its non-openers with the subject `{resend-subject}`, `{delay-days}` days after the original send (default 3).

**Step 1: Find the campaign**

Call `constant-contact-get-campaign` with `name` set to `{campaign-name}`; if nothing comes back, retry with `name.contains`. If more than one matches, list them and stop. If the status is not Done, say only sent campaigns can be resent and stop.

**Step 2: Find the primary email activity**

Call `constant-contact-get-campaign-activity` with the `campaign-id`. Pick the activity whose role is primary_email and keep its campaign-activity-id. If an activity with role resend already exists, show it and stop: the campaign already has a resend.

**Step 3: Size the audience**

Use the campaign's not-opened count. If it is 0, say there is nobody to resend to and stop. Show the original subject (from the activity) next to `{resend-subject}`. If `{resend-subject}` is blank or identical to the original subject, ask the user for a different subject and stop, because resending the same subject performs poorly.

**Step 4: Confirm**

Show: campaign name, original send date, original subject, resend subject, number of non-openers, and the delay in days (`{delay-days}`, 3 if blank; it must be a whole number from 1 to 10). Ask the user to confirm. Do not proceed without an explicit yes.

**Step 5: Schedule**

Call `constant-contact-resend-campaign-to-non-openers` exactly once with the campaign-activity-id, `resend-subject` and `delay-days`. Then call `constant-contact-get-campaign-activity` with the `campaign-id` again and confirm a resend activity now exists. Report what was scheduled.

**Rules & Guidelines:**

* `constant-contact-resend-campaign-to-non-openers` is the only write tool this prompt may call, and only once, after confirmation. Do not call `constant-contact-add-campaign` or `constant-contact-update-campaign`.
* If the resend call fails, report the error and do not retry automatically.

**Validation:**

* If `{delay-days}` is outside 1 to 10, ask for a valid value and stop.