Release 1.2.0: rebuilt installer on R2, old build retired, site live

- Bump to 1.2.0 (language-aware humanizer house style with the bundled
  humanizer-zh skill, resizable chat split and composer, topbar pause
  toggle consistency)
- Packaged the NSIS installer with both humanizer variants verified in
  resources/built-in-skills; uploaded to AC/AgentCompany-1.2.0-x64.exe
  (public 200, byte-exact) and deleted the 1.1.0 build per the release
  cleanup rule (verified 404)
- Landing manifest points at 1.2.0; landing e2e green; deployed to
  Cloudflare Pages and verified live: page shows 1.2.0, tracked
  download 302s to the new installer, stats API healthy

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agentcompany-new",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "private": true,
   "type": "module",
   "description": "Enterprise Electron control plane for AI agent companies.",