fix: use Swift 5.10 for Windows to resolve circular dependency

- Windows CI now uses Swift 5.10 to avoid ucrt/_Builtin_intrinsics cycle
- macOS/Linux continue using Swift 6.0 for LoopAlgorithm compatibility
- Simplified Package.swift to use 5.10 tools version for cross-platform support
- Removed complex Windows conditional logic that wasn't working

Resolves: cyclic dependency in module 'ucrt': ucrt -> _Builtin_intrinsics -> ucrt

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

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

Author: miriamkw

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
         if: matrix.os == 'windows-latest'
         uses: SwiftyLab/setup-swift@latest
         with:
-          swift-version: "6.0"
+          swift-version: "5.10"
 
       - name: Install dependencies
         shell: bash

Package.swift

@@ -1,31 +1,9 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 5.10
 import PackageDescription
 
-let packagePlatforms: [SupportedPlatform]
-let packageLocalization: LanguageTag?
-
-#if os(Windows)
-    packagePlatforms = [
-        .macOS(.v13),
-        .iOS(.v15),
-        .tvOS(.v15),
-        .watchOS(.v8)
-    ]
-    packageLocalization = nil
-#else
-    packagePlatforms = [
-        .macOS(.v13),
-        .iOS(.v15),
-        .tvOS(.v15),
-        .watchOS(.v8)
-    ]
-    packageLocalization = "no"
-#endif
-
 let package = Package(
     name: "LoopAlgorithmToPython",
-    defaultLocalization: packageLocalization,
-    platforms: packagePlatforms,
+    defaultLocalization: "no",
     products: [
         .library(
             name: "LoopAlgorithmToPython",