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Opt-in (Settings -> Presenter; `punktfunk.presenter`, default stage-1). Stage-1's AVSampleBufferDisplayLayer decodes AND presents internally with no per-frame callback, so neither decode nor present can be stamped or hand-paced. Stage-2 takes explicit control: - VideoDecoder: VTDecompressionSession, async output callback stamps decode-completion, session rebuilt on every IDR / format change. Unit-tested (testVideoDecoderAsyncCallbackDeliversPixels). - MetalVideoPresenter: CAMetalLayer + CVMetalTextureCache + a runtime-compiled BT.709 limited-range NV12->RGB shader, present at the next vsync. The CVMetalTextures + pixel buffer are held until the GPU completes. - Stage2Pipeline: pump thread -> decoder -> newest-ready 1-slot ring; the hosting view's display link drains it once per vsync and stamps capture->present (the display-link target time projected into CLOCK_REALTIME). - LatencyMeter gains record(ptsNs:atNs:offsetNs:); the HUD shows a capture->present (glass-to-glass, modulo host render->capture) line, skew-corrected via clockOffsetNs. Measured live ~11 ms p50 vs ~2.2 ms capture->client. - StreamView / StreamViewIOS host the CAMetalLayer as a sublayer + a CADisplayLink (NSView.displayLink on macOS) when stage-2; input capture + HUD unchanged. The session-active gates switch from `pump != nil` to `connection != nil` so capture engages without a StreamPump. Validated: builds macOS/iOS/tvOS; the decode half is unit-tested; the Metal present is live-validated on glass (correct image + the capture->present number). Colorspace is BT.709 SDR for now; 10-bit/HDR + a pacing policy are later. Plan: docs-site/content/docs/apple-stage2-presenter.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>