- Build g3 and studio explicitly with -p flags
- Detect shell and rc file (zsh/bash/fish)
- Auto-add PATH to rc file with user confirmation
- Handle case where PATH is in rc but not loaded
After copying binaries to ~/.local/bin, macOS AppleSystemPolicy would
reject them because the linker-signed code signature becomes invalid.
Now re-sign binaries with ad-hoc signature after copying on macOS.
