fix(server): Antigravity starts for Linux users without a passwd entry

OS Login users have no /etc/passwd entry, and the bundled Antigravity runtime
cannot load libnss_oslogin, so getpwuid fails and the runtime exits 255 before
speaking ACP. Pass the runtime's existing --loas_pwd_fallback_in_corp flag
alongside --uid= on Linux. The regression is folded into the exact spawn
argument test.

Fixes #23005

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
0181b799c2Julius Marminge committed on 10/22/2026, 5:42:30 AMparent6e860ba
3 files changedLine totals unavailable