feat(site): truecast.dev landing page (vanilla static, Cloudflare-ready)

[isingh]

What

The truecast.dev landing page — vanilla HTML/CSS/SVG + a small app.js, no framework, deployable as a static site to Cloudflare Pages. Plus a docs weave so the README answers why a subagent and not just a prompt.

Why vanilla / hand-rolled

One page. No build step, no dependency tree, no framework churn — the same reason suckless.org and sqlite.org keep hand-written HTML homepages. The maintainability risk on a single page isn't the HTML; it's data drift (the cast list duplicating persona.toml). Tracked as a follow-up: a tiny generator that emits the cast grid from persona.toml, and reach for an SSG only if this grows into a multi-page registry browser.

Highlights

• Anti-costume positioning — "real skills it reads on the job, not 'act like a security expert.'"
• Animated SVG context-window diagram — a subagent forks into its own clean window, returns one distilled result. Reduced-motion + no-JS fallbacks.
• Security-engineer dogfood demo leads the proof; Anthropic's 90.2% demoted to supporting corroboration (it's their eval, not ours — per the ICP critique).
• Two verbatim, sourced Anthropic pull-quotes; cast grid grouped into 5 lanes with "see inside →" links to each persona's source.
• Honest CTAs copy all three install lines (marketplace add → install → reload), not just one.
• WCAG-AA, IntersectionObserver reveals, mobile-first.

Build / deploy (Cloudflare Pages)

• Build command: none
• Output directory: site/
• Then point truecast.dev DNS at the Pages project.

Notes

• biome.json excludes site/ (static artifact; biome's a11y/style rules are for app source, not hand-written HTML).
• Docs: README gains a "Why a teammate, not a prompt" section; docs/README.md status table gains a landing-site row.

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