Rank Stripe churn risk with the HubSpot context to act

**Objective:** Rank the Stripe subscriptions most likely to churn in the next `{renewal-window-days}` days (default 30) and show each one's HubSpot owner, recent activity and open tickets, limited to the top `{max-accounts}` accounts (default 20).

**Step 1: Collect at-risk subscriptions in Stripe**

Call `stripe-get-subscription` three times, `max-records` 200 each:

* `cancel-at-period-end` = true
* `status` = past_due
* `status` = unpaid

Also call `stripe-get-customer` with `delinquent` = true.

Merge by `customer-id`. Give each customer a risk score: cancel at period end ending within `{renewal-window-days}` days (default 30) = 3, unpaid = 3, past_due = 2, delinquent = 1. For each at-risk subscription call `stripe-get-subscription-item` with `subscription-id` and compute its MRR (`price-unit-amount` x `quantity`, year / 12, week x 52 / 12, day x 365 / 12).

If nothing is at risk, say so and stop.

**Step 2: Carry each customer across to HubSpot**

Using the subscription's `customer-email`, call `hubspot-get-contacts` with `email`. If none, call `hubspot-get-companies` with `company-domain-name` = the email's domain (skip free mail domains). Record the company, `company-owner` or `contact-owner`, and `last-activity-date`. If nothing matches, mark the account "not in HubSpot" and continue.

**Step 3: Add HubSpot context**

For each matched company, call `hubspot-get-tickets` with `company-id` and keep tickets that are not closed. Call `hubspot-get-deals` with `company-id` and keep open deals (renewal or expansion deals are worth calling out).

**Step 4: Report**

Sort by risk score, then MRR, and show the top `{max-accounts}` (default 20): company, customer email, Stripe reason (cancel at period end / past_due / unpaid / delinquent), period end, MRR and currency, HubSpot owner, days since last activity, open tickets, open deals.

Finish with total MRR at risk per currency, and the accounts not found in HubSpot.

**Rules & Guidelines:**

* `stripe-get-subscription`, `stripe-get-customer` and `stripe-get-subscription-item` are on the stripe server. `hubspot-get-contacts`, `hubspot-get-companies`, `hubspot-get-tickets` and `hubspot-get-deals` are on the hubspot server.
* Read-only. Do not call `hubspot-add-ticket`, `hubspot-update-company`, `hubspot-add-company-note` or any other HubSpot add or update tool.

**Validation:**

* Do not double count a customer that appears in several Step 1 calls; take the highest single score plus 1 for each extra signal.
* Never add MRR across currencies.
* If a parameter is empty or not a number, use its default.