4H-Unfolder v0.2.0.A

What's Changed

• docs(wiki): initial wiki draft — user guide + unfold algorithm by @nghiazer in #52
• feat: papercraft-parity Giai đoạn 1 (macOS FlapMerger/offset + cross-platform coplanar-hide) by @nghiazer in #53
• Merge docs/wiki → main: wiki Phase 3 + papercraft-parity Giai đoạn 1 by @nghiazer in #54
• docs: papercraft-parity plan & progress tracker by @nghiazer in #55

Full Changelog: v0.1.1.A...v0.2.0.A