Codex Windows desktop app 26.609.x crashes silently ~4-8s after launch (regression from 26.602)

Summary
Codex Windows desktop app 26.609.x crashes silently within ~4–8 seconds after launch. The window never finishes opening.

• Worked normally on 26.602 until 2026-06-12, then the app auto-updated to 26.609.4994.0 and began crashing on every launch.
• Codex CLI / codex doctor (runtime) reports healthy; user data (~/.codex) is intact.
• The crash happens right before the app-server / runtime connection completes.

Environment

• Windows 11 Pro 10.0.26100 (x64)
• App: OpenAI.Codex 26.609.4994.0 (MSIX, Microsoft Store), Electron/Chromium 149.0.7827.54
• GPU: NVIDIA GeForce RTX 3060 Laptop (driver 2024-04-30) + AMD Radeon integrated (hybrid)

Crash signature

• Process exits with code 0xE06D7363 (unhandled C++ exception). Crashpad dump generated on every launch.
• Crashpad-parsed throwing module = chrome.dll; crashing process annotation ptype=browser (main/browser process, not the GPU process).
• Last app log line before exit:

[AppServerConnection] Starting app-server connection hostId=local transport=stdio -> state connecting.

• The app-server / runtime child process (codex.exe) is never spawned (verified via real-time process-creation trace) — the browser process throws just before launching it.
• Crashpad reports: %LOCALAPPDATA%\Packages\OpenAI.Codex_2p2nqsd0c76g0\LocalCache\Roaming\Codex\web\Codex\Crashpad\reports (and %APPDATA%\Codex\web\Codex\Crashpad after reinstall).

What still works

• codex.exe doctor passes (auth, network, DB integrity, config parse all OK).
• Launching the bundled Codex.exe directly (bypassing MSIX activation) sometimes survives; launching via normal Start-menu (MSIX activation) crashes consistently.

Tried, did not resolve
Reinstall / app reset, GPU acceleration off (--disable-gpu), GPU cache clear, MSIX re-register, Microsoft Store reinstall, external runtime folder (%LOCALAPPDATA%\OpenAI\Codex) recreation, and [windows] sandbox config changes.

Expected
App launches and stays open as it did on 26.602.