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Problem: masks.roundCorners (#813) rounded rectangle/polygon mask corners only from the command line, control channel or MCP; the Program monitor had no Premiere 26-style corner-roundness handle. Fix: a selected mask with sharp corners between straight edges shows a roundness handle just inside its top-left corner (automation id program.mask.roundness). Dragging it into the shape moves it along the corner bisector, previews the rounded outline live with the radius, and on release dispatches one masks.roundCorners (one undo step per drag). The radius is capped where no corner can grow further. Ellipses, pen masks and rounded corners show no handle. Tooltip translated (es/fr/ja/zh-cn). New headless UI test mask_roundness_ui; docs/gaps.md G18 updated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>