feat(FN-3313): add plugin slot registry, planning mode rewind, and docker n

This merge lands five features spanning the Fusion stack: research settings key renaming (FN-3313, Steps 2–7) across types, defaults, CLI, and engine packages; static plugin slot-host rendering contract documentation (FN-3260); Docker node provisioning routes with a planning modal (FN-3116); plannin

Fusion-Task-Id: FN-3313

packages/cli/src/__tests__/extension.test.ts

@@ -122,13 +122,13 @@ async function enableResearch(cwd: string): Promise<TaskStore> {
   await store.updateGlobalSettings({
     researchGlobalEnabled: true,
     researchGlobalDefaults: { searchProvider: "searxng" },
-    researchSearxngUrl: "http://localhost:8888",
+    researchGlobalSearxngUrl: "http://localhost:8888",
   });
   await store.updateSettings({
     researchEnabled: true,
     researchSettings: { enabled: true, searchProvider: "searxng" },
-    researchWebSearchProvider: "searxng",
-    researchSearxngUrl: "http://localhost:8888",
+    researchGlobalWebSearchProvider: "searxng",
+    researchGlobalSearxngUrl: "http://localhost:8888",
   });
   return store;
 }