Escalate a Salesforce case and get the owner acting today

**Objective:** Escalate case `{case-number}` to priority `{priority}` (default High) because `{reason}`, and make sure its owner has a task to act on it today.

**Step 1: Resolve the case**

Call `salesforce-get-case` with `case-number`. If it is closed, say so and ask whether to continue. Use its case-id.

**Step 2: Read the context**

* `salesforce-get-case-comment` and `salesforce-get-email-message` with `case-id`: the last contact date.
* `salesforce-get-case` with `account-id` and `closed` false: other open cases for the same account.
* `salesforce-get-user` with `name` set to the case owner; require exactly one active user.

**Step 3: Confirm and update**

Show current against proposed priority and status (status Escalated if the org uses it, otherwise keep status). Show the exact values you will send and wait for the user to confirm before any write. If they change anything, show the revised values and confirm again. Then call `salesforce-update-case` once with `id`, `priority` and, if changing, `status`. Append `{reason}` to the description only if the user agrees.

**Step 4: Owner task**

Call `salesforce-add-task` once with subject "Escalated: " followed by the case subject, due today, priority High, what-id the account-id, assigned-to-id the owner's user-id, and comments carrying `{reason}` and the last contact date.

**Step 5: Report**

The case changes, the new task ID, and the other open cases on the account.

**Rules & Guidelines:**

* The only write tools this prompt may call are `salesforce-update-case` (once) and `salesforce-add-task` (once).
* Do not reassign the case or change its contact or account.

**Validation:**

* If the owner cannot be resolved to one active user, update the case, skip the task, and say why.