[BUG] [Windows] 1.2773.0 browser-process V8 OOM on launch

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude Desktop 1.2773.0 closes on launch in Windows even after clean reinstall and a near-empty profile reset.

What Should Happen?

Claude should stay open normally and reach the home screen/login state instead of closing.

Error Messages/Logs

Crashpad dump signature:
- process_type = browser
- Electron 41.2.0
- electron.v8-oom.location = CALL_AND_RETRY_LAST
- electron.v8-oom.is_heap_oom
- OOM error in V8: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory

main.log also shows:
- UnknownError: Internal error opening backing store for indexedDB.open

cowork-service.log still shows the app connects, signature-verifies, then drops with EOF shortly after. The VM service stays healthy.

I also tested with:
- VM bundle compression fixed/uncompressed
- transcript/session caches moved aside
- Chromium caches cleared
- broad Claude profile reset, leaving only claude_desktop_config.json and config.json
- CoworkVMService running normally

The crash still happens from that near-empty state.

Steps to Reproduce

1. Install Claude Desktop 1.2773.0 on Windows.
2. Launch Claude from Start.
3. Wait for startup.
4. Observe that the app closes within seconds, even after a clean reinstall and profile reset.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.2773.0 (884b37) 2026-04-15T14:32:09.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

This is on Windows with an MSIX install (Claude_pzs8sxrjxfjjc). I already ruled out local profile bloat, transcript caches, VM bundle compression, and CoworkVMService instability. The browser-process dump still shows a V8 OOM signature after those resets.