docs(#771): bind tier importer to verified target

README.md

@@ -157,7 +157,10 @@ mosaic storage status
 mosaic storage tier
 mosaic storage export
 mosaic storage import
-mosaic storage migrate
+# `mosaic storage migrate --run` is a schema-wrapper compatibility command only;
+# it delegates solely to mosaic-db-migrator and is not tier data copy.
+# Tier data copy is the KBN-101 secure migrate-tier route after activation, with
+# --target-url-file and --target-attestation-file references only.
 ```
 
 ### Telemetry
@@ -198,8 +201,9 @@ docker compose up -d
 # Install dependencies
 pnpm install
 
-# Run migrations
-pnpm --filter @mosaicstack/db run db:migrate
+# Run PostgreSQL migrations (sole DDL control plane)
+mosaic-db-migrator --run
+mosaic-db-migrator --verify
 
 # Start all services in dev mode
 pnpm dev