`rtk init -g` does not respect CLAUDE_CONFIG_DIR

CLAUDE_CONFIG_DIR is an optional env var which tells Claude Code to read configs from another directory. I use this to isolate my personal configs from shared company configs. I also use it as a way to test my integrations against company defaults.

It would be nice if rtk init either respected CLAUDE_CONFIG_DIR or supported another way to direct where the installation should happen.

$ rtk init -g

RTK hook installed/updated (global).

  Hook:      /Users/joshua/.claude/hooks/rtk-rewrite.sh
  RTK.md:    /Users/joshua/.claude/RTK.md (10 lines)
  CLAUDE.md: @RTK.md reference added

Patch existing /Users/joshua/.claude/settings.json? [y/N]
y

  settings.json: hook added
  Backup: /Users/joshua/.claude/settings.json.bak
  Restart Claude Code. Test with: git status
  filters:   /Users/joshua/Library/Application Support/rtk/filters.toml (template, edit to add user-global filters)

$ echo $CLAUDE_CONFIG_DIR
/Users/joshua/myclaude