feat(FN-3332): add droid runtime plugin with event bridge and process manag

The merge delivers a new `fusion-plugin-droid-runtime` plugin providing a full MCP server and runtime adapter for droid-based agents, with event bridging, process management, tool mapping, and a prompt builder. It also adds agent delegation and org hierarchy tools to the pi extension, while fixing a

Fusion-Task-Id: FN-3332

plugins/fusion-plugin-droid-runtime/src/__tests__/provider.test.ts

@@ -0,0 +1,10 @@
+import { describe, expect, it, vi } from "vitest";
+import * as processManager from "../process-manager.js";
+
+describe("provider dependencies", () => {
+  it("deduplicates discovered model ids", async () => {
+    vi.spyOn(processManager, "discoverDroidModels").mockResolvedValue(["a", "b", "a"]);
+    const ids = Array.from(new Set(await processManager.discoverDroidModels()));
+    expect(ids).toEqual(["a", "b"]);
+  });
+});