v1.0.0

First stable release. Pure-prompt, diagnostic-only authenticity skill: an authenticity band, a 0-100 score, and span-level flags with reasons; never rewrites (rewriting is the separate humanizer skill). Hardened against relocated signatures (clean vocabulary, uniform rhythm, no human markers) and verified with a blind regression battery; full record in evals/RESULTS.md. Vendored detection criteria synced from humanizer. 13-tool adapter set (Claude Code, Cursor, Codex, Antigravity, Gemini CLI, Pi Coder, OpenCode, Copilot, Windsurf, Cline, Continue, Zed, Aider). See CHANGELOG.md.