docs(spec): regenerate approval reference — nested approver enum gains org_membership_level

The generated reference's nested `approvers[].type` inline shape lagged the
top-level enum. Regenerated (pnpm gen:schema && gen:docs) on latest main so the
`check:docs` drift gate passes; xEnumDeprecated is a machine-readable hint and
does not surface in the human reference.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

content/docs/references/automation/approval.mdx

@@ -66,7 +66,7 @@ const result = ApprovalDecision.parse(data);
 
 | Property | Type | Required | Description |
 | :--- | :--- | :--- | :--- |
-| **approvers** | `{ type: Enum<'user' \| 'role' \| 'position' \| 'team' \| 'department' \| 'manager' \| 'field' \| 'queue'>; value?: string }[]` | ✅ | Allowed approvers for this node |
+| **approvers** | `{ type: Enum<'user' \| 'org_membership_level' \| 'role' \| 'position' \| 'team' \| 'department' \| 'manager' \| 'field' \| 'queue'>; value?: string }[]` | ✅ | Allowed approvers for this node |
 | **behavior** | `Enum<'first_response' \| 'unanimous'>` | ✅ | How to combine multiple approvers |
 | **lockRecord** | `boolean` | ✅ | Lock the record from editing while pending |
 | **approvalStatusField** | `string` | optional | Business-object field to mirror request status onto |