Install script downloads wrong binary on macOS arm64

[shreyasgm]

Problem

The install script downloads the generic ccost binary first, which is the Linux x86_64 version. On macOS arm64 (Apple Silicon), this results in:

exec format error: ccost

Steps to Reproduce

1. On macOS arm64, run: curl -sSf https://raw.githubusercontent.com/carlosarraes/ccost/main/install.sh | sh
2. Run ccost
3. Get exec format error

Root Cause

The script tries to download the generic binary before falling back to platform-specific ones. The generic ccost artifact is the Linux build.

Workaround

Download the platform-specific binary directly:

curl -sL "https://github.com/carlosarraes/ccost/releases/latest/download/ccost-darwin-aarch64" -o ~/.local/bin/ccost
chmod +x ~/.local/bin/ccost

Suggested Fix

Update install.sh to always use platform-specific binary names (ccost-darwin-aarch64, ccost-darwin-x86_64, ccost-linux-x86_64) rather than trying the generic binary first.