docs: add CLI demo recording with VHS#13
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Adds a hermetic VHS-based recording of the rb CLI rendering a video in the cloud. Embeds the GIF in the README hero and wires a workflow to regenerate on push to main and on every v* tag. The recording uses a mock rb stub at demos/bin/rb that emits byte- identical output to src/lib/progress.ts — no auth, no network, no flake.
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Summary
rb ffmpegrendering a video in the cloud (12s loop, 1280×720 @ 50fps)Architecture
demos/hero.tapeis the source;demos/_shared.tapecarries chrome + themedemos/bin/rbis a mock that emits byte-identical output tosrc/lib/progress.ts— no auth, no network, no flakedemos/out/hero.gifis tracked;.mp4and.webmare regenerated by CIFiles
README.md— logo + hero embed.gitignore— keepdemos/bin/rbdespite rootrbartifact ruledemos/— recording infrastructure.github/workflows/demos.yml— CI renderTest plan
make -C demosregeneratesdemos/out/hero.giflocally