Fix npm CLI binary installation

[thdxr]

Summary

• Replace the published npm runtime wrapper with an install-time native binary selection flow.
• Generate the public package bin as bin/opencode.exe and copy/link the selected native binary there during postinstall.
• Add a snapshot npm install smoke test to verify the published package can run from npm.

Testing

• bun typecheck from packages/opencode
• node --check script/postinstall.mjs

[greptile-apps]

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[lcyang3]

Getting an error when running npm install opencode-ai -g on Windows.

C:\Users\xxxx>npm install opencode-ai -g
npm warn code 1
npm warn path C:\Users\xxxx\AppData\Roaming\npm\node_modules\opencode-ai
npm warn command failed
npm warn command C:\Windows\system32\cmd.exe /d /s /c node ./postinstall.mjs
npm ERROR It seems your package manager failed to install the right opencode CLI package. Try manually installing "opencode-windows-x64-baseline" or "opencode-windows-x64".