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Marc-André Bombeck
45da6c3c7d
The bundled Skia x64 build (document thumbnails, scanned-PDF rasterization) uses AVX2 instructions; on an x86-64 host without them — Celeron/Atom-class NAS CPUs, pre-2013 Xeons, VMs masking CPU flags — the first canvas call is an uncatchable SIGILL that kills the process and crash-loops the container (live incident: a Synology DS1520+, exit 132 ~18 s after every boot, reported with kernel traps and the correct root cause in hand). The renderer is now gated on a one-time CPU-feature check before the module ever loads: linux/x64 requires the avx2 cpuinfo flag; arm64 and non-Linux are unaffected; unreadable cpuinfo fails open. Behind a closed gate, thumbnail generation and PDF rasterization take their existing fail-soft paths (vault shows type icons; PDFs read as text) and the boot-time thumbnail backfill skips enqueueing. NATIVE_CANVAS=off|on overrides detection, documented in the env example and whitelisted in compose.
