Rank upcoming Salesforce renewals by Stripe churn risk

**Objective:** Find the Salesforce accounts with a contract ending or an open opportunity closing in the next `{days-ahead}` days (default 90), optionally owned by `{owner}`, and rank them by churn risk using their Stripe billing.

**Step 1: Find upcoming renewals in Salesforce**

Call `salesforce-get-contract` with `end-date.from` set to today and `end-date.to` set to today plus `{days-ahead}` days. Call `salesforce-get-opportunity` with `closed` set to false, `close-date.from` set to today and `close-date.to` set to the same end date; keep the ones whose type or name indicates a renewal. Add `owner.contains` set to `{owner}` on both when it is given. Build one list of accounts with the renewal date and amount.

**Step 2: Carry each account to Stripe**

For each account-id, call `salesforce-get-contact` with `account-id` set to it and collect the emails. For each email, call `stripe-get-customer` with `email` set to it. If no email matches, mark the account "not billed in Stripe" and continue.

**Step 3: Read churn signals in Stripe**

For each matched customer-id, call `stripe-get-subscription` with `customer-id`. Signals: status past_due, unpaid, incomplete or canceled; cancel-at-period-end true; current-period-end before the renewal date with no newer subscription. Also use delinquent from `stripe-get-customer`, open invoices from `stripe-get-invoice` (customer-id, status open), and disputes from `stripe-get-dispute` (customer-id).

**Step 4: Report**

A table sorted high risk first: account name, owner, renewal date, contract-number or opportunity name, renewal amount, Stripe status summary, signals found, risk (high, medium, low). High means cancel-at-period-end, canceled, or past_due with an open invoice. Medium means a single failed or past-due signal or an open dispute. Low means active with nothing outstanding. List the "not billed in Stripe" accounts last.

**Rules & Guidelines:**

* `salesforce-get-contract`, `salesforce-get-opportunity` and `salesforce-get-contact` are on the salesforce server. `stripe-get-customer`, `stripe-get-subscription`, `stripe-get-invoice` and `stripe-get-dispute` are on the stripe server.
* The join is contact email against Stripe customer email, matched case-insensitively and trimmed.
* This is read-only. Do not call `salesforce-update-opportunity`, `salesforce-add-task`, `salesforce-update-account`, `salesforce-add-case` or any other salesforce add or update tool.

**Validation:**

* If Salesforce has no renewals in the window, say so and stop.
* If an account maps to several Stripe customers, combine their signals and list every customer-id.