stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.AuditPack/Services/AuditBundleReader.Models.cs

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+using StellaOps.AuditPack.Models;
+using System.Collections.Immutable;
+
+namespace StellaOps.AuditPack.Services;
+
+public sealed partial class AuditBundleReader
+{
+    private sealed record BundleEntry(string Path, string Digest, long SizeBytes);
+
+    private sealed record SignatureVerificationResult
+    {
+        public bool? Verified { get; init; }
+        public string? KeyId { get; init; }
+        public string? Error { get; init; }
+    }
+
+    private sealed record MerkleVerificationResult
+    {
+        public bool Verified { get; init; }
+        public string? Error { get; init; }
+    }
+
+    private sealed record InputDigestVerificationResult
+    {
+        public bool Verified { get; init; }
+        public ImmutableArray<string>? Errors { get; init; }
+    }
+
+    private sealed record ManifestLoadResult(
+        bool Success,
+        string? Error,
+        AuditBundleManifest? Manifest,
+        byte[]? ManifestBytes);
+
+    private sealed record ExtractionResult(
+        bool Success,
+        string? Error,
+        AuditBundleReadResult Result,
+        string TempDir);
+}