c60b6bf2f7
On GitHub runners headless system Chrome dies at launch without --no-sandbox and --disable-dev-shm-usage, cascading all five tests as "browser has been closed" (run 30081843074). The lane had been masked by the shard-4 watchdog kill since the file landed, so it had never actually executed on CI. Flags apply only under CI; local launches keep the default sandbox. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>