Update to gstack Workflows

{
  "description": "Safely inspect, search, modify, and verify files or repositories using the narrowest workspace capability available in ChatGPT or Codex.",
  "included_files": [
    {
      "relative_path": "agents/openai.yaml",
      "size_in_bytes": 241
    }
  ],
  "name": "host-workspace-operator",
  "skill_md_contents": "---\nname: host-workspace-operator\ndescription: Safely inspect, search, modify, and verify files or repositories using the narrowest workspace capability available in ChatGPT or Codex.\n---\n\n# Host Workspace Operator\n\nUse host-provided capabilities, not imaginary plugin-owned filesystem tools. Prefer read, list, search, grep, patch, write, shell, then Python according to the job. Inspect before mutation. Patch focused areas before broad rewrites. Respect repository instructions and user authorization. Never claim an operation ran unless the host produced evidence.\n\nFor mutations, report changed paths and run the closest relevant verification available. If the required capability does not exist, state that limitation rather than inventing a tool.\n"
}