Retry Android emulator with software GPU rendering - #12

Summary

• monitor Android Emulator stderr while starting with -gpu host
• detect the hardware-rendering-unavailable error and retry once with -gpu software
• keep the retry silent except for the existing expo-device-hub:android-utils debug namespace
• make the returned process lifecycle and diagnostic command follow the software-rendered retry
• document the fallback behavior

Why

Headless workers without a usable hardware GPU fail when the emulator is forced to use -gpu host. The launcher previously discarded stderr, so it could neither identify that specific failure nor recover from it.

User impact

Hosts with working hardware rendering keep the existing fast path. In environments where hardware rendering is unavailable, emulator startup now recovers automatically using the current Android Emulator software-rendering mode.

Validation

• bun run build
• bun run typecheck
• bun run lint
• bun run test
• focused fake-emulator test verifies the launch sequence is host followed by software