bin/ is gitignored and not checked in, so the first command in README.md,
COMPILING.md, CONTRIBUTING.md, tools/x/main.ludic and on the site —
clang selfhost/ludicc.seed.ll -o bin/ludicc && ...
failed on a clean checkout with `ld: open() failed, errno=2 for 'bin/ludicc'`.
Verified against a fresh clone. Every copy now leads with `mkdir -p bin`, which
is what the CI workflows had been doing all along.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
