PHLEGM v6 NES VBlank Deferred Render Fix - 2026-10-02

The RP2C02 vblank event now captures completed-frame PPU state before status/NMI becomes CPU-visible, but does not rasterize or present inside the PPU timing callback. Full NES rasterization remains on MachineServiceVideoRefresh/MachineLatchDisplayFrame and consumes the saved pre-NMI state. This preserves the Donkey Kong gray-screen fix while removing display work from the emulated hardware clock path.
