docs(0.0.06): README announcement for engine 0.0.12 + ComfyUI workflow samples

- Version History: current row 0.0.06 / engine 0.0.12
- New "What's New in 0.0.06 (engine 0.0.12)" section: Ideogram4 / Layered (RGBA)
  / ControlNet modes, VRAM-budget + FBCache(cond/uncond) + img2img + Klein
  auto-download nodes, and the 0.0.11->0.0.12 engine gains
- 3.4 Example Workflows: replace stale table with the real 4 workflows
- workflow_sample/: add Ideogram4 / QwenImage-Layered / ControlNet samples and
  introduce them in the sample README (EN + zh)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>