The preview emulator failed every boot with "Unknown AVD name [api37]" and exited immediately (no device -> the bounded wait timed out). avdmanager had created the AVD under $ANDROID_SDK_HOME/.android/avd while the emulator searched $ANDROID_SDK_HOME/avd and $HOME/.android/avd. Pin ANDROID_AVD_HOME to one path both tools use, carry it to the boot step via $GITHUB_ENV, and list AVDs after creation to verify. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>