\$CLAUDE_PROJECT_DIR is Claude Code-specific. Gemini CLI doesn't set it, and on
Windows its path-join logic doubled the value producing unresolvable paths like
D:\Projects\GSD\'D:\Projects\GSD'. Gemini runs project hooks with project root
as cwd, so bare relative paths (e.g. node .gemini/hooks/gsd-check-update.js)
are cross-platform and correct. Claude Code and others still use the env var.
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
