Replace hardcoded marketplace path in plugin/scripts/smart-install.js with
resolveRoot() that uses CLAUDE_PLUGIN_ROOT env var (set by Claude Code for
all hooks), with fallback to script location and legacy paths. Fixes#1128,
#1166 where cache installs couldn't find or install node_modules.
Also fixes installCLI() path (ROOT/plugin/scripts/ → ROOT/scripts/) and adds
verifyCriticalModules() post-install check with npm fallback on failure.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Alex Newman