Promote AgentCompany-New to the repository root and retire the old app

The legacy application - its src, tests, landing site, promo assets, docs,
release tooling, CI workflows, and root configs - leaves the tree; it stays
reachable in history. Everything under AgentCompany-New moves up unchanged:
same package name, so the production userData/database path is untouched,
and e2e/build scripts already resolved paths relative to the project. The
developer cred.txt stays gitignored at its new location. Full verify:ci
passes from the new root.

src/renderer/env.d.ts

@@ -1,10 +1,7 @@
-/// <reference types="vite/client" />
-import type { DesktopApi } from "@shared/contracts";
+import type { DesktopApi } from "../shared/desktop-api";
 
 declare global {
   interface Window {
     agentCompany: DesktopApi;
   }
 }
-
-export {};