Hold promotions for customers with urgent open cases

**Objective:** Find active Dynamics 365 Sales cases with priority `{priority}` (default High), show which Drip campaigns the affected contacts are still receiving, and after confirmation tag them in Drip with `{tag}` (default Open support case).

**Step 1: Open cases in Dynamics 365 Sales**

Call `dynamics-365-sales-get-incidents` with `status` = Active and `priority` = `{priority}` (High if blank). For each case note case-number, case-title, customer, primary-contact and created-on.

**Step 2: The people affected**

For each case, call `dynamics-365-sales-get-contacts` with `full-name` set to the primary-contact. If the case has no primary-contact, call `dynamics-365-sales-get-contacts` with `parent-customer` set to the case's customer instead.

**Step 3: What Drip is sending them**

For each contact email, call `drip-get-subscriber` with `email` set to it, then `drip-get-campaign-subscriber` with the same `email` to list the campaigns they are active in.

**Step 4: Report, confirm, tag**

Show a table: case-number, case-title, customer, contact, email, Drip status, active campaigns, already tagged (yes/no). Ask whether to tag the active subscribers who are not already tagged. Do nothing until the user says yes. Then call `drip-add-subscriber-tag` once per confirmed row with `email` and `tag` = `{tag}` (Open support case if blank), and confirm each with `drip-get-subscriber`.

**Rules & Guidelines:**

* `drip-*` tools are on the drip MCP server; `dynamics-365-sales-*` tools are on the dynamics-365-sales MCP server. If either set is missing, stop and say which server is not connected.
* Email is the only key shared by the two systems. Compare emails case-insensitively and trimmed. Never match on name alone; a name-only match is reported as "possible match, not confirmed".
* The only write tool allowed is `drip-add-subscriber-tag`. Do not pause campaigns or remove people from them (`drip-pause-campaign`, `drip-remove-subscriber-from-campaign`, `drip-remove-subscriber-from-all-campaigns`); recommend that instead if it seems warranted.
* Do not change the cases; do not call `dynamics-365-sales-update-case`.

**Validation:**

* If there are no active cases at that priority, say so and stop.
* If a contact is not in Drip, report "not in Drip, nothing to hold" and continue.
* If a full-name lookup matches several contacts, list them and do not tag any of them.