feat: add platformFilters to BuildableFolderException

Sources/XcodeGraph/Models/BuildableFolderException.swift

@@ -14,21 +14,27 @@ public struct BuildableFolderException: Sendable, Codable, Equatable, Hashable {
     /// The list of private headers.
     public var privateHeaders: [AbsolutePath]
 
+    /// A dictionary mapping files (referenced by their absolute path) to the platform condition to apply.
+    public var platformFilters: [AbsolutePath: PlatformCondition]
+
     /// Creates a new exception for a buildable folder.
     /// - Parameters:
     ///   - excluded: An array of absolute paths to files that should be excluded from the buildable folder.
     ///   - compilerFlags: A dictionary mapping absolute file paths to specific compiler flags to apply to those files.
     ///   - publicHeaders: The list of public headers.
     ///   - privateHeaders: The list of private headers.
+    ///   - platformFilters: A dictionary mapping absolute file paths to platform conditions.
     public init(
         excluded: [AbsolutePath],
         compilerFlags: [AbsolutePath: String],
         publicHeaders: [AbsolutePath],
-        privateHeaders: [AbsolutePath]
+        privateHeaders: [AbsolutePath],
+        platformFilters: [AbsolutePath: PlatformCondition] = [:]
     ) {
         self.excluded = excluded
         self.compilerFlags = compilerFlags
         self.publicHeaders = publicHeaders
         self.privateHeaders = privateHeaders
+        self.platformFilters = platformFilters
     }
 }