consolidation of some of the modules, localization fixes, product advisories work, qa work

src/__Libraries/_archived/StellaOps.Resolver/Policy.cs

@@ -0,0 +1,54 @@
+/**
+ * Policy - Policy Model for Resolver
+ * Sprint: SPRINT_9100_0001_0001 (Core Resolver Package)
+ * Task: RESOLVER-9100-005
+ *
+ * Represents the policy used for verdict evaluation.
+ * Policy digest is included in FinalDigest for reproducibility.
+ */
+
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+namespace StellaOps.Resolver;
+
+/// <summary>
+/// Policy configuration for deterministic resolution.
+/// </summary>
+/// <param name="Version">Policy version string.</param>
+/// <param name="Rules">Policy rules as JSON.</param>
+/// <param name="ConstantsDigest">SHA256 digest of policy constants.</param>
+public sealed record Policy(
+    string Version,
+    JsonElement Rules,
+    string ConstantsDigest)
+{
+    private string? _digest;
+
+    /// <summary>
+    /// SHA256 digest of the policy (version + rules + constants).
+    /// </summary>
+    public string Digest => _digest ??= ComputeDigest();
+
+    private string ComputeDigest()
+    {
+        var input = $"{Version}:{Rules.GetRawText()}:{ConstantsDigest}";
+        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(input));
+        return Convert.ToHexString(hash).ToLowerInvariant();
+    }
+
+    /// <summary>
+    /// Creates a policy from version and rules JSON.
+    /// </summary>
+    public static Policy Create(string version, JsonElement rules, string constantsDigest = "")
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(version);
+        return new Policy(version, rules, constantsDigest);
+    }
+
+    /// <summary>
+    /// Creates an empty policy for testing.
+    /// </summary>
+    public static Policy Empty => new("1.0.0", JsonDocument.Parse("{}").RootElement, "");
+}