Show Mailchimp opt-outs and bounces on Dynamics GP customer records

**Objective:** Find Dynamics GP customers who unsubscribed from, or hard-bounced on, Mailchimp campaigns in the last `{lookback-days}` days (default 30), and after confirmation append a note to each GP customer record so the sales and AR teams know.

**Step 1: Read the Mailchimp events**

Call `mailchimp-get-campaign-unsubscribe` with unsubscribe-date.from set to today minus `{lookback-days}` days and max-records 1000. Keep email, unsubscribe-date, reason and campaign-name. Then call `mailchimp-get-campaign-recipient` with status hard and max-records 1000 to find hard bounces; keep the email-address and campaign-id.

**Step 2: Match to Dynamics GP customers**

Call `dynamics-gp-get-rm-customer` with max-records 500 and map lower-cased `main-email-address` to `customer-id`. Match each Mailchimp email. Ignore emails that match no customer, but count them.

**Step 3: Propose the notes**

Show a table: customer-id, customer-name, email, event (Unsubscribed or Hard bounce), date, campaign, reason, and the note text you will add, in the form `Mailchimp: <event> on <date> from campaign <campaign>. Reason: <reason>.` Ask the user to confirm all rows or name the ones to drop.

**Step 4: Write after confirmation**

Only after confirmation, call `dynamics-gp-rm-customer-note` once per confirmed customer with customer-id, note, append-to-existing-note 1 and add-date-and-time 1. Never send append-to-existing-note 0, which would replace the existing note.

**Step 5: Report**

Each row with Noted or Failed and the error text.

**Rules & Guidelines:**

* `mailchimp-get-campaign-unsubscribe` and `mailchimp-get-campaign-recipient` are on the mailchimp server. `dynamics-gp-get-rm-customer` and `dynamics-gp-rm-customer-note` are on the dynamics-gp server.
* `dynamics-gp-rm-customer-note` is the only tool that may write, and only after confirmation. It writes to the live GP company database.
* Do NOT call `dynamics-gp-rm-customer-update`, `dynamics-gp-rm-customer-address-email`, `mailchimp-update-list-member` or `mailchimp-add-list-member`. Do not resubscribe anyone.

**Validation:**

* If no event matches a GP customer, report the counts and stop.
* If one customer has several events, write one note listing all of them.
* The recipient read has no date filter, so mention that hard bounces are not limited to the lookback window.