test(e2e): full virtualized build+boot+unlock QEMU harness
Opt-in via LIM_E2E_QEMU=1. Models the whole process on a virtio VM (the Pi's USB-gadget net can't be emulated, so it models the software stack, not the board): builds a LUKS image carrying the real lim initcpio Tor artifacts, boots it in QEMU rootless, lets the real netconf/tor/dropbear/ encryptssh chain publish the onion, delivers the passphrase over Tor, and asserts the boot-ok marker on the serial console. Supports a private offline Tor network via chutney. The pure command builders (config.qemu_argv/kernel_cmdline/ssh_argv, qemu_binary), the env parser, and drift guards that keep build_image.sh aligned with the harness run in the normal suite — no QEMU/root/network. The build stage needs root; harness.py primes sudo up front, keeps the credential warm, and reclaims work-dir ownership on every exit path so the pytest tmp cleanup never trips on root-owned files. QEMU stderr is captured so an early exit is debuggable, and each teardown step is fault-isolated so none masks the real error. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Kevin Veen-Birkenbach