OPC # 0001: Extract OPC into standalone repo

ControlPlane.Worker/Steps/HandoffStep.cs

@@ -0,0 +1,27 @@
+using ControlPlane.Core.Interfaces;
+using ControlPlane.Core.Models;
+
+namespace ControlPlane.Worker.Steps;
+
+public class HandoffStep(ILogger<HandoffStep> logger) : ISagaStep
+{
+    public string StepName => "Handoff (Email Magic Link)";
+
+    public Task ExecuteAsync(SagaContext context, CancellationToken cancellationToken)
+    {
+        // TODO: SendGrid / AWS SES
+        // 1. Send email to context.Job.AdminEmail
+        // 2. Include context.MagicLink for password setup
+        // 3. Include login URL: https://{context.Job.Subdomain}
+        logger.LogInformation("[{JobId}] Handoff step is a stub - email provider not yet wired.", context.Job.Id);
+        context.Job.CompletedSteps |= CompletedSteps.HandoffSent;
+        return Task.CompletedTask;
+    }
+
+    public Task CompensateAsync(SagaContext context, CancellationToken cancellationToken)
+    {
+        // Email already sent cannot be recalled - log only
+        logger.LogWarning("[{JobId}] Handoff step: email cannot be compensated if already sent.", context.Job.Id);
+        return Task.CompletedTask;
+    }
+}