docs: add hero demo video playback workflow#106
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The thumbnail-link flow pointed each README thumbnail at a https://github.com/user-attachments/assets/<uuid> URL, which 404s on direct navigation — anonymous visitors clicking a thumbnail hit a 404 instead of a player. GitHub only serves these assets when embedded inline in rendered Markdown. - Embed the recordings as inline HTML <video> players: root README as a side-by-side table, bundle README as an HTML table (GitHub does not render <video> inside GFM table cells). - Bake the curated thumbnail in as the opening ~0.3s of each upload MP4, since GitHub strips <video poster>; the player's first-frame still then shows the end-state proof instead of a blank startup terminal. - prepare-upload-assets prepends the poster frame; apply-video-urls rewrites the inline <video> src attributes; VIDEO_PLAYBACK.md documents the flow and the logged-out browser verification step. Verified in a logged-out Chromium: every README <video> streams (readyState 4, 1600x900, 206 video/mp4) with the thumbnail as its still. Change-Id: I00ba61404b32ae7111218b16fb6d42089b2faf25 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Signed-off-by: Thomas Kosiewski <tk@coder.com>
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mise run demo:agent-uses-agent-tty:upload-assetsnpm run format:checknpm run lintnpm run typechecknpm run validate-bundle -- dogfood/agent-uses-agent-tty --profile canonicalnpx vitest run test/unit/tools/hero-demo.test.tsGIT_CONFIG_GLOBAL=/dev/null mise run ciNote: local
mise run ciwithoutGIT_CONFIG_GLOBAL=/dev/nullwas blocked by the workspace's global Git signing config pointing at a missing 1Password SSH signing binary; rerunning with the global Git config disabled passed.Generated with
mux• Model:openai:gpt-5.5• Thinking:xhigh