- Install graphify as a slash command at ~/.qwen/commands/graphify.md
  using the Markdown + YAML frontmatter format recommended by Qwen Code
  (TOML format is deprecated per official qc-helper docs)
- Strip the Claude-flavored frontmatter (name/trigger) from skill.md and
  rewrap with a single description field for Qwen Code
- Write QWEN.md project rules and register a BeforeTool hook in
  .qwen/settings.json matching read_file|list_directory tool calls
- Route graphify install --platform qwen and graphify qwen install
  subcommands to the new qwen_install() / qwen_uninstall() helpers
- Auto-clean legacy graphify.toml left by earlier installs
- Add 8 install tests covering Markdown format, frontmatter stripping,
  idempotency, merge-with-existing QWEN.md, uninstall, and legacy cleanup

Verified end-to-end against qwen-code 0.14.2: /graphify is recognized
as a slash command and loads the full skill content.