Reduce avoidable setup costs in slow opencode tests while preserving reviewed coverage and recording the benchmark evidence for follow-up test-suite work.
Users installing with pnpm or --ignore-scripts now see a clear explanation
of why the native binary is missing and exact steps to fix it. The shell
script wrapper provides more actionable guidance than the previous Node.js
fallback that only suggested running the postinstall script without context
about why it wasn't run automatically.
Fixes an issue where GitHub artifact downloads could strip executable bits
from binaries, causing Docker builds to fail when using unpacked dist files
directly rather than published tarballs. The chmod now runs before the
publish check to guarantee binaries are executable.