The venv's python is Nix python313 (also inside the container, via the
/nix/store mount), whose loader never searches /usr/lib, so PyPI manylinux
wheels failed with "libstdc++.so.6: cannot open shared object file".
auto-patchelf the staged venv against gcc-lib + zlib; RPATHs are store
paths, so the delivered copy works in the container too. The lib paths join
the input hash so a toolchain bump rebuilds.
Verified locally with mars's exact uv/python313: construct offline from the
staged hub layout and synthesize with voice "Luna".
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
darmanandClaude Opus 5
22caa06904