BUILD_GUIDE.md wrongly said output goes to dist/ (actual: build-output), mac builds produce .dmg (actual target: zip), and cited a nonexistent win-unpacked portable path. Corrected to the verified config truth and added the wine64+wine32:i386 cross-build requirement discovered today: without wine32 the NSIS setup exe ships as a 211KB payload-less stub while electron-builder exits 0. Documented the authoritative 7z payload check + post-build secrets scan. Round1 judge B+5 polish, folded: version placeholders, heuristic-vs-authoritative wording, distro/sudo notes, mac zip wording. Judge: qwen3.8-max stand-in lane. Also removes package.json.bak and index.js.bak (stale junk).