Spot pipeline deals whose contacts are not reachable by email

**Objective:** For Attio deals in stage `{deal-stage}` worth at least `{min-value}` (default 0), check whether each deal's contacts are subscribed and engaging in Mailchimp, and report which deals have cold or unreachable contacts.

**Step 1: List the deals in Attio**

Call `attio-get-record-deals` (Attio) with `deal-stage` set to `{deal-stage}` and `deal-value.min` set to `{min-value}`. Keep `deal-name`, `deal-value`, `deal-owner`, `associated-company` and `associated-people`. If none come back, say so and stop.

**Step 2: Get contact emails from Attio**

For each deal, call `attio-get-record-people` (Attio) with `company.contains` set to the deal's company and keep the people named in `associated-people`, with their `email-addresses`.

**Step 3: Check Mailchimp**

For each email call `mailchimp-get-list-member` (Mailchimp) with `email` set to that address. Keep `status`, `rating` and `average-open-rate`.

**Step 4: Report**

Give a table per deal: deal name, value, owner, each contact with Mailchimp status and open rate. Flag a deal as at risk when every contact is unsubscribed, cleaned, absent from Mailchimp or has an average open rate of zero. Order by deal value, highest first.

**Rules & Guidelines:**

* Tools whose names start with attio are on the Attio server. Tools whose names start with mailchimp are on the Mailchimp server. Both servers must be connected; if a tool from either is missing, say which server is not connected and stop.
* The join key between the two systems is the email address. Compare it case-insensitively and trimmed. Attio people can hold several emails, so match against any of them.
* Do not call any write tool on either server: `attio-add-company`, `attio-add-person`, `attio-add-deal`, `attio-update-company`, `attio-update-person`, `attio-update-deal`, `attio-upsert-company`, `attio-upsert-person`, `attio-delete-company`, `attio-delete-person`, `attio-delete-deal` (Attio), `mailchimp-add-list-member`, `mailchimp-update-list-member`, `mailchimp-add-customer`, `mailchimp-update-customer`, `mailchimp-add-segment-member`, `mailchimp-update-order`, `mailchimp-update-product`, `mailchimp-start-automation`, `mailchimp-pause-automation`, `mailchimp-replicate-campaign` (Mailchimp).

**Validation:**

* A deal with no associated people or no emails is reported as having no reachable contact, not skipped.
* A contact missing from Mailchimp is "not in Mailchimp", which is different from unsubscribed.