v2.1.0

Features

• baoyu-markdown-to-html: render fenced ```mermaid code blocks to local PNG via shared Chrome (CDP) before the standard image-placeholder pipeline runs. New CLI flags: --mermaid-theme <default|forest|dark|neutral|base>, --mermaid-scale <N> (default 2 for @2x resolution), --mermaid-bg <white|transparent|#hex>, and --no-mermaid to disable rendering. Generated images land in imgs/.mermaid-cache/mermaid-<hash>.png and are deduplicated/reused across runs by a 12-char SHA-256 over (code, theme, scale, background, mermaid version). The browser-side <pre class="mermaid"> path is retained as a graceful fallback when Chrome is unavailable or a single block fails to render
• baoyu-post-to-wechat, baoyu-post-to-weibo, baoyu-post-to-x: cascade the same Mermaid → PNG preprocessing into the WeChat / Weibo / X publishing pipelines so diagrams appear as real images in the published posts (previously they fell through as unrendered <pre> blocks). Existing WECHATIMGPH_* / WBIMGPH_* / XIMGPH_* placeholder pipelines pick up the generated PNGs unchanged
• baoyu-md package: new exports preprocessMermaidInMarkdown, extractMermaidBlocks, replaceMermaidBlocks, hashMermaidCode, and MERMAID_VERSION (skills inject the render function so the package stays Chrome-free)
• baoyu-chrome-cdp package: new ./mermaid subexport providing renderMermaidToPng(code, outputPath, options) backed by a process-singleton CDP connection that reuses the shared Chrome profile and ships the vendored Mermaid 10.9.1 UMD bundle as an asset