feat(api): Implement Console Export Client and Models

- Added ConsoleExportClient for managing export requests and responses.
- Introduced ConsoleExportRequest and ConsoleExportResponse models.
- Implemented methods for creating and retrieving exports with appropriate headers.

feat(crypto): Add Software SM2/SM3 Cryptography Provider

- Implemented SmSoftCryptoProvider for software-only SM2/SM3 cryptography.
- Added support for signing and verification using SM2 algorithm.
- Included hashing functionality with SM3 algorithm.
- Configured options for loading keys from files and environment gate checks.

test(crypto): Add unit tests for SmSoftCryptoProvider

- Created comprehensive tests for signing, verifying, and hashing functionalities.
- Ensured correct behavior for key management and error handling.

feat(api): Enhance Console Export Models

- Expanded ConsoleExport models to include detailed status and event types.
- Added support for various export formats and notification options.

test(time): Implement TimeAnchorPolicyService tests

- Developed tests for TimeAnchorPolicyService to validate time anchors.
- Covered scenarios for anchor validation, drift calculation, and policy enforcement.

src/AirGap/StellaOps.AirGap.Time/Models/TimeStatus.cs

@@ -7,5 +7,10 @@ public sealed record TimeStatus(
     IReadOnlyDictionary<string, StalenessEvaluation> ContentStaleness,
     DateTimeOffset EvaluatedAtUtc)
 {
+    /// <summary>
+    /// Indicates whether a valid time anchor is present.
+    /// </summary>
+    public bool HasAnchor => Anchor != TimeAnchor.Unknown && Anchor.AnchorTime > DateTimeOffset.MinValue;
+
     public static TimeStatus Empty => new(TimeAnchor.Unknown, StalenessEvaluation.Unknown, StalenessBudget.Default, new Dictionary<string, StalenessEvaluation>(), DateTimeOffset.UnixEpoch);
 }