Tell reps when a deal contact unsubscribes in Mailchimp

**Objective:** Find everyone who unsubscribed from a Mailchimp campaign in the last `{lookback-days}` days (default 30), match them to Pipedrive, and flag the ones attached to open deals. If `{add-notes}` is yes (default no), add a Pipedrive note to each matched person after confirmation.

**Step 1: Get the unsubscribes from Mailchimp**

Call `mailchimp-get-campaign-unsubscribe` with `unsubscribe-date.from` set to today minus the lookback. Keep `email`, `first-name`, `last-name`, `campaign-name`, `unsubscribe-date` and `reason`. Reduce to one row per email, keeping the most recent.

**Step 2: Carry each email across to Pipedrive**

For each email call `pipedrive-get-person` with `email`. Keep `person-id`, `name`, `organization-name`, `owner-name` and `open-deals`. If not found, count the email as Not in Pipedrive.

**Step 3: Report**

* Table 1, On open deals: name, organization, owner, open deals, campaign, date, reason. Sort by open deals, highest first.
* Table 2, Other Pipedrive contacts: the same columns.
* One line: how many unsubscribes were not in Pipedrive.

Group Table 1 by owner so each rep can see their own contacts.

**Step 4: Optional notes**

Only if add-notes is yes:

1. For each matched person call `pipedrive-get-note` with `person-id` and `note.contains` set to Unsubscribed from Mailchimp. If such a note exists for this campaign, skip that person.
2. Show the people who will get a note and ask the user to confirm. If they do not, stop.
3. Call `pipedrive-add-note` once per person with `person-id` and `content` set to: Unsubscribed from Mailchimp campaign, the campaign name, on the date, with the reason if there is one.

**Rules & Guidelines:**

* Tools named `mailchimp-*` are on the mailchimp server and are only read here. Tools named `pipedrive-*` are on the pipedrive server.
* The only write allowed is `pipedrive-add-note`, and only when add-notes is yes and the user confirms. Do not call `mailchimp-update-list-member`, `mailchimp-add-list-member`, `pipedrive-update-person`, `pipedrive-update-deal`, `pipedrive-add-activity` or any other write tool. Never try to resubscribe anyone.

**Validation:**

* Match emails case-insensitively and trim spaces.
* If there are no unsubscribes in the window, say so and stop.
* If none of the unsubscribes are in Pipedrive, report the count and stop.