feat(FN-1114): merge fusion/fn-1114 (auto-resolved)

- feat(FN-1114): complete all steps — plugin examples, docs, and scaffold command

plugins/examples/fusion-plugin-notification/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["src/**/*.test.ts"],
+    pool: "threads",
+  },
+});