Redesign website with animated hero and Bunny-hosted demos

[alejandro-ao]

Summary

Redesign the website as a clean computational atlas, with a full-viewport black hero and Tau's dark-theme mint accent (#a7f3f0).

• Add an original rotating wireframe that morphs automatically between a torus, sphere, and Möbius strip every four seconds. Keep pause/play, reduced-motion support, offscreen suspension, and a static SVG fallback; no shape picker.
• Simplify the navbar to a plain τ glyph and refresh the homepage, documentation, releases, roadmap, and mobile layouts.
• Add an interactive agent-loop explanation and four real feature demos from the v0.4.0 launch thread: local inference, model catalog updates, extensions, and system prompts.
• Serve production videos from Bunny CDN, with muted viewport autoplay, native controls, written alternatives, source attribution, and respect for manual pauses. Keep local optimized MP4s and posters for development previews.
• Add reproducible browser checks and design/media provenance notes.

Validation

Passed on this branch:

• Hugo production and development builds.
• Pagefind production indexing: 30 pages.
• Live Bunny playback and demo browser suite, using the production site's allowed referrer.
• Local demo browser suite: playback, autoplay, offscreen pause/resume, manual pause, reduced motion, source/docs links, responsive layouts, and no-JavaScript fallback.
• Hero browser suite: 12 viewport sizes, full-viewport height, automatic morph cycle, pause/play, reduced motion, fallback rendering, and dark-theme accent parity.
• uv run ruff check website/tests and uv run ruff format --check website/tests.
• node --check for the changed/new JavaScript files.
• git diff --check.

Hugo still emits the existing missing taxonomy-layout warning.

Hosting and scope notes

• Bunny originals are optimized H.264 MP4s and were verified with real browser playback and HTTP byte-range requests. Additional encoded renditions were still processing when migration was configured; documented Bunny MP4 fallback URLs are included.
• Bunny's existing referrer restriction is unchanged. hugo server uses local backups; production builds select the CDN URLs. No credentials are included.
• Includes roughly 12 MiB of optimized local video backups and lightweight posters.
• Unrelated .agents/ files and the generated website/public/landing.js working-tree change are intentionally excluded.
• No application behavior changes; merging will use the existing website deployment workflow.