Merge origin/main at 8e806ae1b2. Keep native helper compilation in
prepareDesktopNativeDependencies and keep bundling/beforePack consume-only.
Bind helper sources and headers into preparation identities and cache keys;
copy admitted executable resources beside node_modules and preserve signing
semantics in product freshness checks.
Verified desktop typecheck, focused native/packaging/UI and gateway/cache
tests, and the real Linux preparation/copy/Xvfb execution path. Incoming
upstream anti-slop findings remain unchanged; no baseline was raised.
4efb36f81e