diff --git a/workplans/CORE-WP-0005-data-migration-and-cutover.md b/workplans/CORE-WP-0005-data-migration-and-cutover.md
index c33992f..28889db 100644
--- a/workplans/CORE-WP-0005-data-migration-and-cutover.md
+++ b/workplans/CORE-WP-0005-data-migration-and-cutover.md
@@ -67,6 +67,21 @@ state_hub_task_id: "fa68858a-b18e-4f09-a477-6b11e54099d4"
 
 With operator approval, switch production traffic such as `hub.coulomb.social` to Core Hub. Keep rollback available until stabilization passes.
 
+**Prerequisites (blocking, found in T03 dual-run 2026-07-02):**
+
+1. **Migrate/seed the ops-* type vocabularies.** Migrated Inter-Hub widgets
+   reference 7 widget types (`ops-endpoint`, `ops-environment`, `ops-host`,
+   `ops-migration-wave`, `ops-readiness-gate`, `ops-service`,
+   `ops-service-catalog`) plus their event types, none of which exist in Core
+   Hub's seeded registries. Either extend the `core-hub.migration.v1` bundle
+   with `widgetTypeRegistry` / `eventTypeRegistry` collections, or seed the
+   ops-* vocabularies into Core Hub before cutover, or migrated widgets are
+   referentially incomplete.
+2. **Auth-posture change is a consumer break.** `/api/v2/hubs` is public on
+   Inter-Hub but protected on Core Hub — any anonymous consumer of the hub
+   list must gain a token before cutover.
+3. Operator approval + rollback plan (existing gate).
+
 
 ## Progress 2026-07-02 — staging import completed