feat: Add Codable conformance to HashAlgorithm

Added Codable conformance to HashAlgorithm enum for compatibility
with consuming packages that need to encode/decode hash algorithms.

This is required for FileSystemKit's DiskImageHash which needs to be Codable.

Changes:
- HashAlgorithm: String, Sendable, CaseIterable → String, Codable, Sendable, CaseIterable
- Version: 1.2.1 → 1.2.2

All 149 tests passing ✅

Author: rickhohler

Sources/DesignAlgorithmsKit/DesignAlgorithmsKit.swift

@@ -51,7 +51,7 @@ import Foundation
 /// - WASM (limited - excludes hash/crypto types that require NSLock)
 public struct DesignAlgorithmsKit {
     /// Library version
-    public static let version = "1.2.1"
+    public static let version = "1.2.2"
 }
 
 // Re-export all modules

Sources/DesignAlgorithmsKit/HashComputation.swift

@@ -15,7 +15,7 @@ import CommonCrypto
 #endif
 
 /// Supported hash algorithms
-public enum HashAlgorithm: String, Sendable, CaseIterable {
+public enum HashAlgorithm: String, Codable, Sendable, CaseIterable {
     case sha256 = "sha256"
     case sha1 = "sha1"
     case md5 = "md5"

test_import.swift

@@ -0,0 +1,4 @@
+import DesignAlgorithmsKit
+
+print("Testing import...")
+print(type(of: HashComputation.self))