fix(cv): bind letter proposals to current sources and preserve document choices

JobTrackerApi.Tests/AiWorkspaceTests.cs

@@ -2,12 +2,13 @@ using JobTrackerApi.Data;
 using JobTrackerApi.Models;
 using JobTrackerApi.Services;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Moq;
 using Xunit;
 
 namespace JobTrackerApi.Tests;
 
-public sealed class AiWorkspaceTests
+public sealed partial class AiWorkspaceTests
 {
     private sealed class FakeAi : ISummarizerService
     {
@@ -16,6 +17,7 @@ public sealed class AiWorkspaceTests
         public string? LastInstruction;
         public string? ActualProvider;
         public string? FallbackReason;
+        public Func<Task>? BeforeReturn;
         // The source text the module assembled — what the prompt actually saw.
         public string? LastText;
         public Task<string?> SummarizeSectionAsync(string instruction, string text, int maxLength = 180, int minLength = 40)
@@ -34,6 +36,7 @@ public sealed class AiWorkspaceTests
             CancellationToken cancellationToken = default)
         {
             var generated = await SummarizeSectionAsync(instruction, text, maxLength, minLength);
+            if (BeforeReturn is not null) await BeforeReturn();
             return generated is null ? null : new AiGenerationResult(generated, ActualProvider, "test-model", FallbackReason,
                 FallbackReason is null ? "local_primary" : "external_fallback");
         }