Turn abandoned 2Checkout checkouts into a HubSpot follow-up list

**Objective:** Put the HubSpot contacts of up to `{max-records}` 2Checkout leads (default 50) that have not become 2Checkout customers into the manual HubSpot contact list named `{list-name}`, creating the list if it does not exist. Nothing is written until the user confirms.

**Step 1: Read leads from 2Checkout**

Call `2checkout-get-lead` with `max-records` set to `{max-records}` (50 if empty). Keep `lead-code`, `billing-email`, `billing-first-name`, `billing-last-name`, `billing-company` and `generated-from`. Set aside leads with no email and count them.

**Step 2: Drop leads that already bought**

For each distinct `billing-email`, call `2checkout-get-customer` with `email` set to it. If a customer comes back, the lead converted: list it as converted and leave it out.

**Step 3: Find the contacts in HubSpot**

The join is the 2Checkout `billing-email` against the HubSpot contact `email`, compared case-insensitively after trimming. For each remaining email, call `hubspot-get-contacts` with `email` set to it and keep `record-id`. If none comes back, list the lead as not in HubSpot; if several come back, list them and leave the lead out.

**Step 4: Find or plan the list in HubSpot**

Call `hubspot-get-lists` with `name` set to `{list-name}` and `object-type` set to 0-1. If one comes back and its `processing-type` is MANUAL, use its `list-id` and call `hubspot-get-contact-list-membership` with `list-id` set to it to drop contacts that are already members. If it comes back with any other processing type, say it cannot be changed and stop. If none comes back, plan to create it.

**Step 5: Confirm**

Show the list (existing, with its size, or to be created), the contacts to add (name, email, lead code), and the converted, not-in-HubSpot and skipped leads. Ask for an explicit yes and offer to exclude rows. Do not continue without a yes.

**Step 6: Write and verify**

If the list must be created, call `hubspot-add-list` once with `name` set to `{list-name}`, `object-type` 0-1 and `processing-type` MANUAL, and use the returned `id`. Then call `hubspot-add-list-members` with `list-id` and `record-ids` set to the confirmed contact record-ids, comma-separated, in batches of at most 100. Call `hubspot-get-contact-list-membership` with `list-id` and confirm each contact is now a member. Report added, already present, failed and skipped.

**Rules & Guidelines:**

* Tools whose names start with 2checkout belong to the 2checkout server and tools whose names start with hubspot belong to the HubSpot server. Both servers must be connected.
* The only write tools allowed are `hubspot-add-list`, at most once, and `hubspot-add-list-members`, once per batch, both only after the confirmation in Step 5. Call no other hubspot-add, hubspot-update, hubspot-rename, hubspot-remove, hubspot-subscribe, hubspot-unsubscribe or hubspot-import tool. Adding someone to a list does not subscribe them to email, and this prompt must not change subscriptions.
* Never call `2checkout-lead-markused`, `2checkout-lead-update`, `2checkout-lead-add`, `2checkout-customer-add` or any other 2checkout tool that adds, updates or marks records. 2Checkout is only read here.
* Do not create HubSpot contacts for leads that are not in HubSpot; report them instead.

**Validation:**

* If `{list-name}` is empty, ask for it and stop.
* If no lead is left after Steps 2 and 3, say so and stop without creating a list.
* If the user declines or does not answer, stop with nothing written.