v0.1.5
chore: bump version to 0.1.5 and add darwin-x64 to install.sh
The earlier 0.1.4 commit forgot to update package.json/cli.ts so the
shipped binary reported 0.1.3 despite the tag. Bump fresh and ship a
clean 0.1.5 with darwin-x64 support across all surfaces (build, release
workflow, install.sh, brew formula).