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Adds a 54-second product tour to the homepage and a 75-second MCP walkthrough to the setup guide. Both use native video controls, English captions, full transcripts and click-to-play loading. The product tour shows the saved public example; the MCP guide shows recorded tool responses and a source review of the same invented protocol.
The two MP4 assets now support single HTTP byte ranges, so playback can seek correctly through the Workers asset route. Posters and fast-start MP4 files keep the initial page light.
Validation: 1,088 hosted web tests, 27 private checks, 74 MCP tests, 54 Python tests and 15 package checks passed. Typechecking, generated-page checks, privacy checks, video decoding, desktop/mobile playback and exact byte-range checks passed.