fix: align FSR4 installer eligibility

Author: dreyvinixz

Config.md

@@ -207,7 +207,7 @@ FsrNonLinearPQ=auto
 FsrAgilitySDKUpgrade=auto
 ```
 
-`Dx12Upscaler=ffx` selects the current FFX DX12 backend. The official signed FSR 4.0.2 upscaler DLL is included as a pinned release input; use `UpscalerIndex=auto` unless you are diagnosing a title-specific issue.
+`Dx12Upscaler=ffx` selects the current FFX DX12 backend. The official signed FSR 4.0.2 upscaler DLL is included as a pinned release input for the optional Radeon RX 9000/RDNA4 installer task; use `UpscalerIndex=auto` unless you are diagnosing a title-specific issue. Other hardware should use the provider selected by `auto` (normally FSR 3.1.5 or another supported backend).
 
 To improve image quality, try to match the vertical or horizontal FOV of your game. The default is 60° vertical FOV and most of the time it works fine. The camera, reactive-mask, barrier, velocity and temporal-tuning values are runtime parameters: changes from the menu or a completed INI reload are published for the next evaluation. `UpscalerIndex`, `FGIndex`, colour-space hints and library/bootstrap options require context recreation or a restart; do not change them while diagnosing a live frame. Output scaling changes are handled through the normal resolution/resource-recreation path.
 

docs/UPSTREAM_INTEGRATION.md

@@ -97,7 +97,7 @@ The shared [`scripts/Verify-Integration.ps1`](../scripts/Verify-Integration.ps1)
 
 The official AMD FidelityFX SDK 2.0.0 release contains FSR 4.0.2 and a signed `Kits/FidelityFX/signedbin/amd_fidelityfx_upscaler_dx12.dll`. Its verified binary is version `4.0.2.44888` with SHA-256 `241E6E5E4D848424EB8EC9A6B22C43FE34CF0CF52D30002CA435BA42E53A9CA0` and a valid Advanced Micro Devices signature.
 
-The previous local asset had a different SHA-256 (`9123F83739E7BB39FCB135CAFC339606DEC78A74C650338AD275EE45C2D59D02`) and was not signed, so it was never eligible for release. It has now been deliberately replaced with the verified official binary, and the manifest and integration gate require both its exact SHA-256 and the valid AMD Authenticode signature. This approves the *release input* only; Release x64, benchmark, and FINAL FANTASY VII REBIRTH regression tests remain mandatory before the integration itself can be treated as validated.
+The previous local asset had a different SHA-256 (`9123F83739E7BB39FCB135CAFC339606DEC78A74C650338AD275EE45C2D59D02`) and was not signed, so it was never eligible for release. It has now been deliberately replaced with the verified official binary, and the manifest and integration gate require both its exact SHA-256 and the valid AMD Authenticode signature. The installer exposes it only as the optional official Radeon RX 9000/RDNA4 path; other hardware retains the provider selected by `auto`. This approves the *release input* only; Release x64, benchmark, and FINAL FANTASY VII REBIRTH regression tests remain mandatory before the integration itself can be treated as validated.
 
 ## Non-authoritative artefacts
 

installer/setup.iss

@@ -64,7 +64,7 @@ Name: "english"; MessagesFile: "compiler:Default.isl"
 
 [Tasks]
 Name: "gtx_compat"; Description: "Apply GTX/Kepler Compatibility Patch (Forces D3D12 Feature Level 11.0)"; Flags: unchecked
-Name: "fsr4_rdna"; Description: "Install experimental FSR 4.0.2 for AMD RDNA 2 and 3 GPUs"; Flags: unchecked
+Name: "fsr4_rdna4"; Description: "Install official FSR 4.0.2 for AMD Radeon RX 9000 (RDNA 4) GPUs"; Flags: unchecked
 [Files]
 
 
@@ -84,7 +84,7 @@ Source: "assets\configs\OptiScaler.ini"; DestDir: "{app}"; Flags: ignoreversion
 Source: "build\libxess.dll"; DestDir: "{app}"; Flags: uninsneveruninstall skipifsourcedoesntexist; Components: upscalers
 Source: "build\libxess_dx11.dll"; DestDir: "{app}"; Flags: ignoreversion skipifsourcedoesntexist; Components: upscalers
 Source: "build\amd_fidelityfx_*.dll"; DestDir: "{app}"; Flags: ignoreversion skipifsourcedoesntexist; Components: upscalers
-Source: "assets\fsr4\amd_fidelityfx_upscaler_dx12.dll"; DestDir: "{app}"; Flags: ignoreversion skipifsourcedoesntexist; Tasks: fsr4_rdna
+Source: "assets\fsr4\amd_fidelityfx_upscaler_dx12.dll"; DestDir: "{app}"; Flags: ignoreversion skipifsourcedoesntexist; Tasks: fsr4_rdna4
 Source: "build\D3D12_OptiScaler\*"; DestDir: "{app}\D3D12_OptiScaler"; Flags: ignoreversion skipifsourcedoesntexist; Components: upscalers