convertClaudeToCodexMarkdown() was missing path replacement — unlike Copilot/Gemini/Antigravity converters which all replace $HOME/.claude/ paths. This left hardcoded .claude references in Codex agent files, causing ENOENT when gsd-tools.cjs tried to load from ~/.claude/ on Codex installations. Closes #1430 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>