release: prepare 0.1.5 with RDNA2 kernels and in-game DLSS/FSR switching

- Add native preset K kernels for gfx1030–gfx1036 using software matrix
  products, with fast and accuracy builds and RDNA2 motion kernels.
- Follow OptiScaler's DLSS and RR preset overrides, sanitize unsupported
  values and select the preset matching the feature's quality mode.
- Enable FSR 4 under NVIDIA GPU spoofing by exposing real AMD PCI IDs
  to OptiScaler and FidelityFX modules; bundle AMD's loader and upscaler.
- Keep K on native kernels in engine auto mode unless HIP is selected,
  and fall back to CUDA for M/L when shader_float8 is unavailable.
- Add native-engine K GPU timings, preset recreation harness controls
  and regression coverage; fix the input-wait test's glibc name clash.
- Update configuration, installer guidance and release documentation,
  simplify the README and move gameplay videos to docs/videos.md.

RDNA2 kernels remain untested on RDNA2 hardware; software matrix
arithmetic was validated against WMMA on RDNA3.

kernels/k/pwin_common.h

@@ -56,6 +56,11 @@ __device__ __forceinline__ uint32_t lane_id()
     return __builtin_amdgcn_mbcnt_lo(~0u, 0u);
 }
 
+// RDNA2: the f16-accumulator WMMA variants need the instruction; the f32 path (software products) serves them
+#ifdef __GFX10__
+#undef PWIN_NATIVE_F16ACC
+#undef PWIN_F16ACC_NATIVE
+#endif
 typedef wm_op op_t; // WMMA operand: u8v (gfx11) or u4v (gfx12)
 
 // one k16 step with the f16 accumulator of NVIDIA's f16 wmma (rounded after the step)