launch-video

Build a release video for a Spool version. The output is a 1080p MP4 plus a poster JPG, intended for X / Twitter. Runtime scales with feature count: 20–40s, 3–8 feature beats + brand outro, optionally a stylised capstone scene before the outro for releases whose payoff is a tangible outcome the captured clips can't show on their own. ## Mental model A release video for Spool has two halves running in parallel on screen: 1. **Left third** — a text panel that introduces the current scene (kicker `01 / 04 — POLISH`, a 2-line headline, a 1–2 line sub). 2. **Right two-thirds** — the real Spool app, recorded as a native macOS window. The camera (CSS `transform-origin + scale` on the `.window`) zooms into the specific UI region for each feature. Focus on the active feature is carried by one of two devices: - **Amber annotation rectangles** inside `.window` that track the camera — good for "look at this strip" callouts. Cheap and precise when the feature is a single bounded region. - **Spotlight mask** — an SVG overlay that dims everything except 1–2 transparent "holes" punched through. Softer falloff means small coordinate drift disappears into the dim instead of reading as a misaligned outline. Dual holes let you keep the preview bright while a control on the right side lights up in sync with a click. See `references/spotlight.md`. This is **not** a PPT: text panel and demo coexist continuously, with hard match-cuts between feature clips. Don't reintroduce slide-style title c...