🚀 release: promote dev to main

[Focus695]

What's in this release

• 📦 new (skills): distill human-writing into bowrite — the material gate（材料门槛）, 段段有新货 (move 6), voice-and-rhythm craft, and hard bans scoped to from-scratch public prose. Attribution added in skills/README, ADR-002 amendment, and writing-style.md's three-layer note (human-writing, MIT, by KKKKhazix).
• Checks: npm run book:index zero warnings, npm run book:release-check clean.