Know which addresses to clean before bounces hurt deliverability

**Objective:** Audit bounces from the last `{lookback-days}` days (default 90) and identify the addresses and domains that should be cleaned from the lists.

**Step 1: Pull the bounces**

Compute the start date as today minus `{lookback-days}` days (90 if blank). Call `constant-contact-get-campaign-bounce` with `created-date.from` set to that date. If `{domain}` is given, also set `email-address.contains` to `{domain}`. Raise `max-records` if the result looks truncated.

**Step 2: Analyse**

* Count bounces by bounce-type.
* Group by email-address and find repeat bouncers: addresses that bounced on two or more different campaigns.
* Group by the domain part of email-address and list the domains with the most bounces. A single domain with many bounces of the same type suggests a blocking or typo domain (gmial.com, hotmial.com) rather than bad individual addresses.
* Call `constant-contact-get-campaign` with `last-sent-date.from` set to the same start date and work out each campaign's bounce rate (bounces / sends). Flag any campaign above 2%.

**Step 3: Check the worst offenders**

For up to 10 repeat bouncers, call `constant-contact-get-contact` with `email-address` to show their permission-to-send and created-date, and `constant-contact-get-contact-list-member` with `email-address` to show which lists they are on.

**Step 4: Report**

1. Bounces by type, with counts.
2. Campaigns above a 2% bounce rate.
3. Top 10 domains by bounces, flagging likely typo domains.
4. A table of repeat bouncers: email, bounce count, bounce types, lists they are on.
5. A recommended clean-up list, split into: remove (repeat hard bounces), watch (one bounce or soft bounces only).

**Rules & Guidelines:**

* This is read-only. Do not call `constant-contact-update-contact`, `constant-contact-update-contact-list` or any other add or update tool. The user decides what to remove.
* Treat a single soft bounce as normal; do not recommend removing it.

**Validation:**

* If there are no bounces in the period, say so and report the period checked.