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.

landing/package.json

@@ -1,29 +0,0 @@
-{
-  "name": "agent-company-landing",
-  "private": true,
-  "version": "1.0.0",
-  "type": "module",
-  "scripts": {
-    "dev": "next dev",
-    "build": "next build",
-    "start": "next start",
-    "preview": "wrangler pages dev out"
-  },
-  "dependencies": {
-    "framer-motion": "12.38.0",
-    "next": "16.2.6",
-    "react": "19.2.4",
-    "react-dom": "19.2.4"
-  },
-  "devDependencies": {
-    "@tailwindcss/postcss": "^4.2.2",
-    "@types/node": "^24.9.1",
-    "@types/react": "^19.2.2",
-    "@types/react-dom": "^19.2.2",
-    "tailwindcss": "^4.2.2",
-    "typescript": "^5.9.3"
-  },
-  "overrides": {
-    "postcss": "8.5.14"
-  }
-}