fix: Correct Windows library name from randomx.dll to librandomx.dll

MinGW Makefiles with BUILD_SHARED_LIBS=ON automatically adds the 'lib'
prefix to shared libraries, producing 'librandomx.dll' instead of
'randomx.dll'. This fix updates the GitHub Actions workflow and all
documentation to reflect the actual CMake output.

Changes:
- GitHub Actions workflow: Update source_lib to 'librandomx.dll'
- CLAUDE.md: Update Windows build command to use librandomx.dll
- README.md: Update Windows build command to use librandomx.dll

This aligns Windows naming with Linux (librandomx.so) and macOS
(librandomx.dylib) conventions, ensuring consistency across all platforms.

Fixes: GitHub Actions Windows build failure
Closes: #[issue_number_if_applicable]

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: LucasMLK

.github/workflows/build-and-release.yml

@@ -39,7 +39,7 @@ jobs:
             cmake_args: '-G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release -DARCH=native -DBUILD_SHARED_LIBS=ON'
             artifact_name: 'librandomx_windows_x86_64.dll'
             output_lib: 'librandomx_windows_x86_64.dll'
-            source_lib: 'randomx.dll'
+            source_lib: 'librandomx.dll'
 
     steps:
       - name: Checkout code

CLAUDE.md

@@ -60,7 +60,7 @@ cd randomx
 mkdir build && cd build
 cmake .. -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release -DARCH=native -DBUILD_SHARED_LIBS=ON
 make -j4
-cp -i randomx.dll ../../src/main/resources/native/librandomx_windows_x86_64.dll
+cp -i librandomx.dll ../../src/main/resources/native/librandomx_windows_x86_64.dll
 cd ../..
 ```
 

README.md

@@ -98,7 +98,7 @@ cd randomx
 mkdir build && cd build
 cmake .. -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release -DARCH=native -DBUILD_SHARED_LIBS=ON
 make -j4
-cp -i randomx.dll ../../src/main/resources/native/librandomx_windows_x86_64.dll
+cp -i librandomx.dll ../../src/main/resources/native/librandomx_windows_x86_64.dll
 ```
 You can also compile using Visual Studio, as the official RandomX repository provides solution files.