v0.4.1 fixes the reproducible-build buildPhase to `cp --no-preserve=mode`, so
firmware builds succeed under proot (nix-portable's fallback when user
namespaces are unavailable in the container). Without it every phase-2 firmware
build failed with `cp: setting permissions … No such file or directory` and fell
back to the analysis-only SBOM.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>