Move a Salesforce deal forward with a clean next step

**Objective:** Update the opportunity `{opportunity-name}` to stage `{stage}` with next step `{next-step}`, optionally moving its close date to `{close-date}`, and log a matching follow-up task.

**Step 1: Resolve the opportunity**

Call `salesforce-get-opportunity` with `name` set to `{opportunity-name}`, falling back to `name.contains`. Require exactly one open opportunity; if it is closed, say so and stop.

**Step 2: Sanity-check the change**

* Moving backwards in stage, or to a closed stage, needs an explicit yes from the user.
* A close date in the past is not allowed; ask for a new one.
* If the new stage usually carries a different probability, propose one and say why.

**Step 3: Confirm and update**

Show the current and proposed stage, next step, close date and probability side by side. 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-opportunity` once with `id` and only the changed fields.

**Step 4: Follow-up task**

Resolve the opportunity owner with `salesforce-get-user` by `name`. Offer to create a task whose subject is the next step, due 3 business days from today, what-id the opportunity-id, assigned-to-id the owner. On a yes, call `salesforce-add-task` once.

**Step 5: Report**

What changed on the opportunity, and the task ID if one was created.

**Rules & Guidelines:**

* The only write tools this prompt may call are `salesforce-update-opportunity` (once) and `salesforce-add-task` (once, only after a separate yes).
* Never change amount, account or owner.

**Validation:**

* If either write reports failure, show the error and stop without retrying.