libiconv is the only /nix/store dep the darwin stdenv bakes in (everything
else is system frameworks + libSystem/libobjc). The smoke-test now rewrites
that load path to /usr/lib/libiconv.2.dylib (ABI-compatible, present on
every Mac), re-signs ad-hoc (install_name_tool breaks the sig; arm64
requires a valid one), then verifies no /nix/store paths remain, the
signature is valid, and the native binary launches. Flake comment updated
to reflect the propagated-libiconv reality.
claude@clouddev1
9a126782f1