[adamdotdevin]

What does this PR do?

Ships the restyled docs (#62424, #62425) to opencode.ai/docs. Readers there now get the same docs dev.opencode.ai has served since #62425: the site's shell with David's docs components, the lockup menu, the bracketed section nav, the Contents rail, the site's search palette and the phone menus. URLs, Markdown twins (Accept: text/markdown and /docs/<page>.md), llms.txt, the sitemap (opencode.ai URLs), Pagefind search, the V1 fallbacks (/docs/ja/ → /v1/docs/ja/) and the funnel attributes stay as they are. dev.opencode.ai keeps its noindex from #62430.

The build-time switch is gone, so every deploy builds the same docs:

• deleted src/docs/legacy/ (the old document, layout, components, rehype plugins, client.ts and global.css)
• removed restyled(mode) from src/docs/config.ts, the restyle option in vite.ts, script/build.ts and render.tsx, and restyle in virtual:docs-pages
• the docs build always applies the production CSS plugins, the JS and CSS budgets and the Pagefind exclusions
• src/docs/AGENTS.md describes the one design

check-docs.yml still passes --mode dev to the docs build. The build accepts and ignores it so CI keeps passing without touching .github/**. A follow-up can drop --mode dev from the workflow and the option from src/docs/script/build.ts together. #62428 (build both modes in CI) no longer applies.

How did you verify your code works?

• services/site: bun typecheck, bun run typecheck:tsc, bun test (192 pass); root bun run check
• Full bun script/build.ts --mode production and --mode dev on an exe.dev VM: both pass the budgets (client 5.7 kB, docs.css 26.0 kB gzipped), link validation, the asset-prefix check and the Worker start check (production without X-Robots-Tag, dev with it). 70 pages, 69 Markdown twins
• /docs output of the production build is byte-identical to the dev build's and to origin/dev's --mode dev output (diff -r, same hashed files as dev.opencode.ai serves today: docs-D6fIs2-I.css, client-Cjc98lXL.js). The only difference between the two deploys is dev's noindex rule in _headers
• Headless Chromium against the production Worker in Miniflare: /docs/config/ renders with the sidebar and Contents, search for "keybinds" returns 5 results and closes on Escape, the lockup menu opens and closes (outside click, keyboard), the phone menu opens and closes at 390 px, no console errors

Visual

<svg xmlns="http://www.w3.org/2000/svg" width="240" height="72" viewBox="0 0 240 72" fill="none" stroke="currentColor">
  <style>
    .old{animation:o 4s ease-in-out infinite}
    .new{opacity:0;animation:n 4s ease-in-out infinite}
    @keyframes o{0%,35%{opacity:.5}50%,85%{opacity:0}100%{opacity:.5}}
    @keyframes n{0%,35%{opacity:0}50%,85%{opacity:1}100%{opacity:0}}
    @media (prefers-reduced-motion:reduce){.old,.new{animation:none}.old{opacity:0}.new{opacity:1}}
  </style>
  <rect x="44" y="6" width="152" height="60" rx="4" stroke-opacity=".35"/>
  <g class="old" stroke-width="1.5">
    <path d="M44 16h152" stroke-opacity=".6"/>
    <path d="M78 16v50" stroke-opacity=".6"/>
    <path d="M52 24h18M52 31h14M52 38h16M88 26h60M88 34h90M88 42h80M88 50h70"/>
  </g>
  <g class="new" stroke-width="1.5">
    <rect x="52" y="12" width="6" height="6" fill="currentColor" stroke="none"/>
    <path d="M62 15h12"/>
    <path d="M52 26h3M52 33h3M52 40h3M52 47h3" stroke-opacity=".5"/>
    <path d="M58 26h12M58 33h14M58 40h10M58 47h13"/>
    <path d="M90 16h44" stroke-width="2.5"/>
    <path d="M90 28h62M90 36h56" stroke-opacity=".7"/>
    <rect x="90" y="43" width="62" height="14" rx="1.5" stroke-opacity=".6"/>
    <path d="M164 15h24M164 26h18M168 33h14M168 40h16" stroke-opacity=".6"/>
    <path d="M164 24v4" stroke-width="2"/>
  </g>
</svg>

[opencodejr]

No blocking problems. With legacy/ and the restyled switch gone, every docs build renders the restyle, and nothing still points at the removed code.

I ran the docs build after bun run generate twice, once with --mode dev and once with the production default. Both pass the budgets, link validation and the asset-prefix check, and the two outputs are byte-identical, with the same hashed files dev.opencode.ai serves (client-Cjc98lXL.js, docs-D6fIs2-I.css). typecheck:tsc and bun test (192) pass.

The public API is unchanged: this is internal to the site build, and --mode on the docs build is still accepted and ignored, so check-docs.yml keeps working.