feat: move vault ssh signing into a plugin (C5)

src/backend/tests/plugins/sync-registry.test.ts

@@ -96,15 +96,16 @@ describe("core sync entities", () => {
     registerCoreSyncEntities();
   });
 
-  // The frozen array also lists networkTopology, snippets/snippetFolders and
-  // dashboardServiceLinks/homepageItems, now registered by the
-  // network-topology, snippets and homepage plugins rather than core.
+  // The frozen array also lists networkTopology, snippets/snippetFolders,
+  // dashboardServiceLinks/homepageItems and vaultProfiles, now registered by
+  // the network-topology, snippets, homepage and vault plugins rather than core.
   const PLUGIN_OWNED_TYPES = new Set([
     "networkTopology",
     "snippets",
     "snippetFolders",
     "dashboardServiceLinks",
     "homepageItems",
+    "vaultProfiles",
   ]);
 
   it("registers every core-owned entity the Electron client knows about", () => {