Figure Extractor v0.4.0: a clearer path from paper to figures

Figure Extractor now has a complete install-and-use experience for researchers and agent users.

Highlights:

• Bilingual project homepage with generated brand logo and real extraction output
• Copy-ready $figure-extractor prompts and detailed usage guides
• Fresh live example on Attention Is All You Need: 5/5 figures, all ok
• Codex UI metadata and explicit skill invocation guidance
• GitHub Actions coverage for Python 3.10 and 3.12

Validation: 52 tests pass, standalone build matches source, and the skill installs successfully with npx skills.