docs: drop edition tagline from architecture brief PDFs

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bg6jx9vHNHzB91qyV64GQ7

docs/external/build/make-pdf.sh

@@ -16,6 +16,6 @@ build() { # <md> <out.pdf> <lang> <title> <eyebrow>
   echo "wrote pdf/$out"
 }
 
-build ../architecture-brief.en.md architecture-brief.en.pdf en "VPP AI Platform Brief" "Architecture brief · condensed external edition"
-build ../architecture-brief.zh.md architecture-brief.zh.pdf zh "虚拟电厂 AI 平台架构" "系统架构 · 对外精简版"
+build ../architecture-brief.en.md architecture-brief.en.pdf en "VPP AI Platform Brief" ""
+build ../architecture-brief.zh.md architecture-brief.zh.pdf zh "虚拟电厂 AI 平台架构" ""
 rm -rf "$tmp"

docs/external/build/page.mjs

@@ -204,7 +204,7 @@ em{color:var(--ink-2)}
 </nav>
 <main>
 <header class="title">
-  <p class="eyebrow">${process.env.PAGE_EYEBROW || 'System architecture · external edition'}</p>
+  ${process.env.PAGE_EYEBROW ? `<p class="eyebrow">${process.env.PAGE_EYEBROW}</p>` : ''}
   <h1>${inline(titleLine.trim())}</h1>
   <p class="subtitle">${inline(subtitle || '')}</p>
   ${meta ? `<div class="meta">${metaParts.map((m) => `<span>${inline(m)}</span>`).join('')}</div>` : ''}