v3.0.0 - SEO + Blog Tags + Profile Components + Portable Playbook

What's New in v3.0.0

Phase X - Astro Site SEO Foundation

• Sitemap: @astrojs/sitemap@3.2.1 integrated, sitemap-index.xml auto-generated
• RSS Feed: @astrojs/rss -> /rss.xml endpoint with zh-cn language tag
• SEO Meta: BaseLayout.astro with conditional canonical, OG, and Twitter Card tags
• 404 Page: terminal-style custom 404 page with navigation buttons

Phase Y - Blog Tag System

• Tag Cloud page (/blog/tags/) with frequency-scaled font sizes and count badges
• Tag filter pages (/blog/tags/[tag]) - 7 static routes auto-generated
• Tag pills in article cards and post pages are now clickable links

Phase Z - Profile README New Components

• GitHub Profile Trophy section (darkhub theme, 1x6 layout)
• 3D contribution graph in a details fold (night-rainbow SVG, daily auto-update via Actions)
• Blog RSS Feed subscription badge in Connect section

Playbook Enhancement

• S12 Project Onboarding Protocol (4-phase process)
• S13 Team Self-Evolution (Brain as team architect)
• S14 Agent Knowledge Accumulation (L1/L2/L3 system)
• S15 GitHub API Operations Guide (cross-platform token extraction)
• S16 Open Source Project Branding Standards
• S17 Playbook Customization Guide (zero-context cold-start protocol)

Fixed

• OG/Twitter image tags are now conditional; removed non-existent /og-default.png default
• 3D contrib workflow now pushes SVGs to output branch to match README image URLs

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code-reviewer: APPROVED