docs: v0.8.45 harness framing — READMEs, website, metadata, contributors
- README: new tagline, What Is It/Key Features → harness framing
- README.zh-CN/ja-JP: matching Chinese/Japanese translations
- web/app/page.tsx: updated hero, description, three-column grid, flywheel
- web/app/layout.tsx: metadata title + description for harness framing
- website/index.html + zh/: hero, feature grid, install command
- README: updated contributor credits for v0.8.45 (idling11, gaord, h3c-hexin, cyq1017, reidliu41, wdw8276, zlh124)
Hunter Bown
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