Skills use '$gsd-*' syntax which isn't visible in the '/' command menu.
Adding parallel install to ~/.codex/prompts/gsd_*.md surfaces all GSD
commands as /prompts:gsd_* entries in the Codex UI slash command menu.
- Add installCodexPrompts() to install commands/gsd/*.md as prompts/gsd_*.md
- Add convertClaudeToCodexPrompt() to strip to description/argument-hint only
- Remove cleanupOrphanedFiles() code that was deleting prompts/gsd_*.md
- Both skills (30) and prompts (30) now install side by side
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>