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.

tests/test_optiscaler_packaging.py

@@ -138,6 +138,8 @@ class OptiScalerConfigTests(unittest.TestCase):
             for name in ('d3d12.dll', 'd3d12core.dll'):
                 fixture(inputs / 'vkd3d' / name, b'MZ fixture d3d12core.dll\0 then d3d12core.dll\0' if name == 'd3d12.dll' else b'fixture')
             fixture(inputs / 'opti/OptiScaler.dll')
+            for name in ('amd_fidelityfx_dx12.dll', 'amd_fidelityfx_upscaler_dx12.dll', 'Licenses/FidelityFX_v2_LICENSE.md'):
+                fixture(inputs / 'opti' / name)
             fixture(inputs / 'opti/OptiScaler.ini', upstream_ini().replace('\n', '\r\n').encode())
             dlss = fixture(inputs / 'nvngx_dlss.dll')
             core = fixture(inputs / '_nvngx.dll')
@@ -193,6 +195,10 @@ class OptiScalerConfigTests(unittest.TestCase):
                             self.assert_routing(data)
                             configs.append(data)
                             self.assertEqual(data, (repo / 'dist' / name / 'OptiScaler.ini').read_bytes())
+                            # OptiScaler's FSR 3.X/4 upscaler: AMD's loader and upscaler beside it
+                            for ffx in ('amd_fidelityfx_dx12.dll', 'amd_fidelityfx_upscaler_dx12.dll',
+                                        'd4r/licenses/FidelityFX-LICENSE.txt'):
+                                self.assertIn(ffx, archive.namelist())
                         else:
                             self.assertNotIn('OptiScaler.ini', archive.namelist())
                             self.assertNotIn('dxgi.dll', archive.namelist())