a9e6e8cb82
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BetterCam (DXGI) only supports one capture session per display, so creating a second engine for the KC test produced no frames when a target was already running. Now uses LiveStreamManager.acquire() which ref-counts and reuses the running capture. Also removed double postprocessing — ProcessedLiveStream already applies filters, so re-applying them in the KC test halved the resolution (960x400 → 240x100).