Add canonical CV artifact pipeline

Models/StructuredCvProfile.cs

@@ -3,6 +3,7 @@ namespace JobTrackerApi.Models;
 public sealed class StructuredCvProfile
 {
     public string Version { get; set; } = "1";
+    public StructuredCvMetadata Metadata { get; set; } = new();
     public StructuredCvContact Contact { get; set; } = new();
     public List<string> Summary { get; set; } = new();
     public List<StructuredCvJob> Jobs { get; set; } = new();
@@ -14,6 +15,25 @@ public sealed class StructuredCvProfile
     public List<StructuredCvSection> Sections { get; set; } = new();
 }
 
+public sealed class StructuredCvMetadata
+{
+    public int? ProfileVersion { get; set; }
+    public int? AppliedExtractionRunId { get; set; }
+    public DateTimeOffset? UpdatedAtUtc { get; set; }
+    public Dictionary<string, StructuredCvFieldMetadata> Fields { get; set; } = new();
+}
+
+public sealed class StructuredCvFieldMetadata
+{
+    public double? Confidence { get; set; }
+    public string? Method { get; set; }
+    public string? SourceSnippet { get; set; }
+    public int? SourcePage { get; set; }
+    public string? SourceBlockId { get; set; }
+    public string? ReviewState { get; set; }
+    public DateTimeOffset? LastUpdatedAtUtc { get; set; }
+}
+
 public sealed class StructuredCvContact
 {
     public string? FullName { get; set; }