Site cohesion: converge on the design-system canon + landing stack section

[NicholasKissel]

Summary

A 10-agent audit of the site against the CLAUDE.md design system (96 findings → 11 verified themes) found the canon had zero adopters: EYEBROW_CLASS, editorial/Eyebrow, and MarketingButton were imported by no page, and every surface hand-rolled its own labels, buttons, cards, and headings. This PR converges the whole site onto the existing canon, then reworks the landing page around a new product-stack section.

Design-system sweep (93cdda6)

• Eyebrows — all section labels now use EYEBROW_CLASS / new EYEBROW_ON_INK_CLASS (27 off-canon tracking-[0.16em] variants eliminated)
• Buttons — one metric (rounded-md px-4 py-2 text-sm font-medium) via the PRODUCT_HERO_* constants + new PRIMARY_INK_BUTTON_CLASS; the no-fill border-ink/20 ghost is retired; dead MarketingButton.tsx deleted; button canon documented in CLAUDE.md
• Shadows — 21 outer drop shadows stripped from marketing cards/tiles/diagrams (inset edge-lights kept; modals/tooltips/dropdowns exempt)
• Cards — flat bg-white/55 fills, border-ink/10 hairlines, p-7; white gradients removed; pricing tiers unified onto one light surface (InkPanel reserved for code/terminal/data); CatalogCard gains a highlight pine-frame prop
• Legacy — zinc/shadcn tokens retokenized to ink/paper (ProblemSection, window chromes, TypesenseSearch, Header light branches); #FF4500 + rainbow hues replaced with theme tokens; blog prose now renders Prose surface="paper"
• Headings — hand-written tracking converged onto HERO_H1_CLASS / SECTION_H2_CLASS / PRODUCT_HERO_H1_CLASS (which now includes depth-wash)
• Shells — blog gains paper-grain; dynamic-apps/workflows/cloud gain the shared closing CTA; section rhythm unified on py-16 md:py-32; accent-spark rule restored (one ember per page on /startups and /agentos)
• Shared kit — glow-pill surface and the deploy card/button kit promoted to single modules (glowPill.ts, deployKit.tsx); byte-identical duplicates deleted
• Dead files removed — STYLING_CONSISTENCY_TODO.md (prescribed the retired dark theme), ArticleHeader, ArticleLayout, LandingHeader, PlatformIcons, CodeEditor (all verified unreferenced)

Landing page (9426070)

• New StackSection after the hero: indexed catalog of the four products with Actors pine-highlighted as the primitive — Workflows and Dynamic Apps get their first homepage presence
• Actors/agentOS deep-dive sections unmounted from the landing page (components kept in repo)
• Workflows and Dynamic Apps get real logo SVGs in the house format (white rounded-square outline + glyph, matching Actors/agentOS), registered in productLogos so ProductLockup, ProductBar, DocsLanding, and the stack cards all upgrade at once

Verification

• Production build passes: 421 pages
• Greps: zero remaining tracking-[0.16em], retired ghost buttons, white card gradients, #FF4500, hand-written -0.035em/-0.025em tracking, or zinc tokens on marketing surfaces (sanctioned exceptions: Learn dark-shell branches, functional overlay shadows)
• Browser pass over every touched page (200s) + screenshot review of the stack section, product heroes, product bar accent tiles, and docs landing

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