The note above the core-crate check said the UI and app crates would join
"once the Android shell exists". They already had. Building `darkroom-android`
for aarch64 takes 4m23s and produces `libdarkroom.so`, linked for Android 28 —
which is what the step below now checks, and what a device installs.
Rewritten to say what the core check is actually for: a fast, link-free gate
that fails early and names a smaller suspect, ahead of the full build.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>