Vulkan capture: preserve the game's sync mode, drop the capture throttle

The capture must never change vsync, and must not frame-limit itself.

- Removed the ~150 Hz capture throttle from VkCapture. It was wrong: vsync already
  paces capture (a 144 Hz FIFO game presents 144x/s, so we mirror 144x/s). The only
  limiter left is ring backpressure (skip a frame if the reaper is behind), which is
  correctness, not a cap, and never touches the game's present thread or sync mode.
- The layer/hook already pass VkSwapchainCreateInfoKHR straight through, so the
  present mode (= the sync mode) is untouched. Added a presentMode log to prove it.

Measured on Sphere Spectacle (direct launch, layer attached): presentMode=2 (FIFO),
steady 144.0 fps, and with the throttle gone the mirror now tracks it at 144/s
(was capped ~130). The earlier 400-600 fps reading was a direct-launch artifact --
a non-foreground windowed FIFO app isn't throttled by DWM -- not the layer, and not
the case through Steam (144). vk_validate now states the mirror follows the present
rate (no throttle) and still asserts a present-rate floor.

Full suite 21/21.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

hook/src/vk_capture.hpp

@@ -146,11 +146,6 @@ private:
 	VkCommandPool m_pool = VK_NULL_HANDLE;
 	Slot m_slots[kSlots];
 	int m_next = 0;
-	// Cap capture to ~150 Hz: a guest stream is at most the host's refresh (usually 60, at most 144),
-	// so mirroring every present of an uncapped 400+ FPS game is pure wasted reaper CPU. Throttling
-	// here -- not on the game -- keeps the mirror smooth while freeing the cores the game wants.
-	static constexpr double kMinCaptureIntervalMs = 1000.0 / 150.0;
-	double m_last_submit_ms = 0.0;
 
 	// --- D3D11 shared texture (reaper thread only) ---
 	ID3D11Device* m_d3d = nullptr;