v0.176.0: Windows ARM64 desktop, disable builtin skills, plus session recovery and Auto model fixes

New features

- Disable builtin skills - New --disable-builtin-skills flag turns off Factory-provided skills while keeping your own skill sources
- Windows ARM64 desktop - The desktop app now ships a native Windows ARM64 build (app)
- Usage cap alert emails - Admins now receive email alerts as usage approaches configured caps (app)

Bug fixes

- Session recovery - Cancelling a tool no longer corrupts session history, and existing corruption is repaired automatically
- Auto model retries - Auto model turns now retry automatically when a model is unavailable
- Disconnected prompts - Permission and input prompts are now suppressed while disconnected
- macOS sleep - Notification sounds no longer prevent macOS from going to sleep (app)
- PDF generation - PDF generation errors now surface immediately instead of hanging (app)