Honour each Drip opt-out at exactly the scope asked

**Objective:** Act on an opt-out request from `{email}` at scope `{scope}`: a campaign name, all-campaigns, workflow followed by the workflow name, or unsubscribe (stop all mail). If `{scope}` is blank, ask which scope they want before writing anything.

**Step 1: Read the subscriber**

Call `drip-get-subscriber` with `email` = `{email}`. If no one matches, stop and say so. If already unsubscribed, report that and stop unless the request was a specific campaign.

**Step 2: Show what they currently get**

Call `drip-get-campaign-subscriber` with `email` = `{email}` and list their campaigns.

**Step 3: Resolve the target**

* Campaign name: match it against the list from Step 2. If it is not there, they are not in it; say so and stop. If several match, list them and stop.
* workflow: call `drip-get-workflow` with `name` (then `name.contains`) to get the workflow-id. If several match, list them and stop.

**Step 4: Confirm**

State exactly what will happen, and what will not (for example, removing from one campaign leaves their other campaigns and broadcasts running). Wait for the user to say yes.

**Step 5: Act, once**

* One campaign: `drip-remove-subscriber-from-campaign` with `id` = `{email}` and `campaign_id`.
* all-campaigns: `drip-remove-subscriber-from-all-campaigns` with `id` = `{email}`.
* workflow: `drip-remove-subscriber-from-workflow` with `id` = `{email}` and `workflow_id`.
* unsubscribe: `drip-unsubscribe-subscriber` with `id` = `{email}`.

**Step 6: Verify**

Re-read with `drip-get-subscriber` and `drip-get-campaign-subscriber` and report the result. Workflow removal cannot be read back; say the call succeeded.

**Rules & Guidelines:**

* Use the narrowest scope that satisfies the request. Never escalate to unsubscribe unless that was the scope asked for.
* Call exactly one remove or unsubscribe tool. Do not call `drip-update-subscriber`, `drip-add-subscriber` or any tag tool.

**Validation:**

* If the request is ambiguous between scopes, ask; an unwanted full unsubscribe cannot be undone without the person's consent.