docs: add source-provenance comment to registry-and-build (card [91] backfill 14/16)

docs/registry-and-build.md

@@ -1,3 +1,9 @@
+<!-- verified: 2026-09-06
+     ansible@ccbda37 : host_vars/rocky-docker/docker_stacks.yml, roles/container_update, playbooks/container_update.yml
+     iac@49ff427 : ansible/roles/secure_vault/vault_agent/defaults/main.yml
+     trilium : dcRUArk5dWH8, bW84ccRoAJ5i, hWiIGZIlvQiN
+-->
+
 # 📦 Self-Hosted Registry & Build Pipeline
 
 > [!NOTE]