v0.0.8

Fix

• video_metadata now reports the video stream's duration instead of the container's. When a clip's audio outlasts its video (e.g. ASL-LEX own.mp4: video 1.9019s, audio 1.920s), the container header carries the longer duration but downstream consumers (ffmpeg padding, model APIs that measure the video stream) only see the video. Falls back to container.duration when the stream doesn't stamp one (notably browser-recorded webm — covered by the existing test). #2