Absolute hook paths in settings.json break when ~/.claude is bind-mounted
into a container at a different path, or when running under WSL with a
Windows Node.js that resolves a different home directory.
Add `--portable-hooks` CLI flag and `GSD_PORTABLE_HOOKS=1` env var opt-in.
When set, buildHookCommand() emits `$HOME`-relative paths instead of resolved
absolute paths, making the generated hook commands portable across bind mounts.
Fixes#2190
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
62261a3166