Release 1.3.0: Windows installer rebuilt, site updated, 1.2.0 exe retired

The 1.3.0 Windows build carries everything since 1.2.0: the self-healing
queue (transient provider failures park instead of killing tasks), the
chat-wake and task-done lifecycle contracts, the goal-review loop with
audited complete_goal, workspace execution tools (list/read/run) behind the
requires_filesystem grant, default web access (web_search/fetch_url with
SSRF guard) for every agent, and the board/shell UI fixes.

Shipping steps, each verified: verify:ci green -> signed NSIS build (both
humanizer skill variants bundled) -> uploaded to R2 and probed 200 at full
size -> manifest bumped (Windows v1.3.0; macOS stays on its live v1.2.0
DMGs, now labeled honestly) -> landing e2e 12/12 -> Pages deployed ->
production /api/download 302s to the 1.3.0 exe and download-stats serves ->
superseded 1.2.0 exe deleted from R2 (404 confirmed). Bucket holds exactly
one Windows build again.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agentcompany-new",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "private": true,
   "type": "module",
   "description": "Enterprise Electron control plane for AI agent companies.",