OPC # 0001: Extract OPC into standalone repo

ControlPlane.Core/Models/BuildRecord.cs

@@ -0,0 +1,24 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ControlPlane.Core.Models;
+
+public enum BuildStatus { Running, Succeeded, Failed }
+public enum BuildKind   { DockerImage, DotnetProject, NpmProject }
+
+/// <summary>
+/// Persisted record of a single build run — image build, dotnet build, or npm build.
+/// Stored in ClientAssets/builds.json.
+/// </summary>
+public class BuildRecord
+{
+    public string          Id          { get; set; } = Guid.NewGuid().ToString("N")[..8];
+    public BuildKind       Kind        { get; set; }
+    public string          Target      { get; set; } = string.Empty;  // image name or project path
+    public BuildStatus     Status      { get; set; } = BuildStatus.Running;
+    public DateTimeOffset  StartedAt   { get; set; } = DateTimeOffset.UtcNow;
+    public DateTimeOffset? FinishedAt  { get; set; }
+    public int?            DurationMs  { get; set; }
+    public string?         ImageDigest { get; set; }  // populated for DockerImage builds
+    public List<string>    Log         { get; set; } = [];
+}