feat(web): dark Linear-grade landing redesign with a live ultrawork chat-replay demo

[code-yeongyu]

What

Full redesign of lazycodex.ai (packages/web only — no marketplace/CLI files touched):

• Design system first: token layer (design-system.css) + reusable primitives (components/design-system/: layout, typography, surfaces, actions, brand mark), all documented in packages/web/DESIGN.md. Dark graphite canvas, green-only brand accent, hairline elevated surfaces, editorial dotted column rules.
• Live ultrawork demo: a faithful Codex-desktop window that replays ONE grounded ulw run as an appending chat transcript — the user's ask opens the session, then tool rows / prose / code chips append beneath it (900ms cadence), walk to the checkpoint, and loop. Fixed dark window, fixed 680px box with inner scroll (zero outer layout shift), zero in-window controls, reduced-motion renders the completed transcript statically. Every visible string traces to the copy ledger — no invented claims.
• Sections: hero (open canvas, LCP-safe system type), install, command cards, feature workflows + built-in skills band, team mode (window-chrome thread mock), ulw-research, Hephaestus showcase, docs CTA, footer; docs page restyled on the same tokens.
• Final quality pass (this PR's tip): a 10-agent AI-slop sweep over the whole branch diff (-30 LOC of dead pre-rewrite data/comments), then a design-system consolidation — new MonoTag and CardLabel primitives, polymorphic AccentSurface (as/padding) absorbing hand-rolled repeats, accepted-but-ignored props removed, five zero-consumer legacy tokens + dead .card-gradient-* utilities deleted, and DESIGN.md reconciled with the shipped v10 demo.

Verification

• e2e: 57/57 (functional, responsive, SEO, copy-ledger, demo contract) — .omo/evidence/v11-full-e2e.txt
• Lighthouse (real Chrome, desktop + mobile presets): 100/100/100/100 — .omo/evidence/v11-lighthouse.txt
• biome lint + tsc --noEmit + new-string copy audit: clean
• opennextjs-cloudflare build: passes — .omo/evidence/v11-opennext.txt
• Consolidation verified rendered-DOM-identical (class sets byte-equal, tags unchanged) by an independent reviewer pass; band screenshots eyeballed on the built server.

Note on the source-guidance bot

This PR is repo-local website work (packages/web + evidence), not Codex CLI changes — the "open against oh-my-openagent" guidance doesn't apply, and landing it here was explicitly directed by the repo owner. Merging immediately for that reason.

🤖 Generated with Claude Code

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Summary by cubic

Rebuilt the packages/web landing with a dark, tokenized design system and a live Codex‑desktop ultrawork chat‑replay demo to better showcase the product and improve consistency. Adds new sections, consolidates primitives, deletes dead code, and ships with full e2e and Lighthouse 100x4.

• New Features

  • Dark design system: graphite canvas, green accent, hairline borders; updated OG, manifest, favicon, and docs to match.
  • Live ultrawork demo: fixed 680px window, appending transcript (user ask → tool rows/prose/code), no controls, loops after checkpoint; reduced‑motion renders the full transcript.
  • New sections: Team Mode and ulw‑research (grounded copy), plus restored glass Ultrawork badge showcase; updated hero and information architecture.
  • E2E coverage added for the demo and sections; local build, tsc, and lint clean; Lighthouse desktop/mobile 100/100/100/100.

• Refactors

  • Design‑system primitives: added MonoTag and CardLabel; AccentSurface now supports as and padding; folded repeated patterns across sections.
  • Tightened component props (removed accepted‑but‑ignored props), deleted unused tokens and old .card-gradient-* utilities, and dropped pre‑rewrite demo scene data.
  • Synced DESIGN.md to the shipped components and Codex window behavior; updated header, footer, install block, and command cards to the new tokens.

^{Written for commit a8c3d2a. Summary will update on new commits.}