feat(404): redesign not-found page with agent onboarding card - #59
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Replace the bare 404 with an on-brand standalone page: mono "Error 404" header, Quickstart + Steel Skills navigation cards, and a copyable llms-full.txt hint card to onboard coding agents. Adds an ai-context meta tag pointing agents at the LLM-optimized docs index. Self-owns the dark theme since the runtime not-found shell renders outside the root layout.
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What
Replaces the bare, unstyled 404 with an on-brand standalone page.
llms-full.txthint card to onboard coding agents (components/home/llms-hint-card.tsx, mirrorsCLIInstallCard)ai-context<meta>tag pointing agents at the LLM-optimized docs index (present in raw HTML)Why the standalone (no docs chrome) design
At runtime, every wrong URL hits the
[...slug]catch-all and triggersnotFound(), which renders in Next's bare__next_error__shell — outside the root layout andDocsLayout. That means navbar/sidebar/search cannot be delivered on a 404 while keeping a correct HTTP 404 status. So the page self-owns its dark theme (darkwrapper) and uses the cards as curated escape routes.Verification
bun run buildcompiles clean;/_not-foundbuildsnext start: real pages → 200, unknown URLs → 404ai-contextmeta tag present in raw HTML headbiome checkcleancurlcan't execute the client-side render). Recommend eyeballingbun run dev→/overview/does-not-existbefore merge.