feat(data): add WeekReportRepository with tests

tests/ClaudeDo.Worker.Tests/Repositories/WeekReportRepositoryTests.cs

@@ -0,0 +1,43 @@
+using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Tests.Infrastructure;
+
+namespace ClaudeDo.Worker.Tests.Repositories;
+
+public class WeekReportRepositoryTests : IDisposable
+{
+    private readonly DbFixture _db = new();
+    public void Dispose() => _db.Dispose();
+
+    private static readonly DateOnly Start = new(2026, 5, 28);
+    private static readonly DateOnly End = new(2026, 6, 3);
+
+    [Fact]
+    public async Task Upsert_Insert_Then_GetByRange_RoundTrips()
+    {
+        using (var ctx = _db.CreateContext())
+            await new WeekReportRepository(ctx).UpsertAsync(Start, End, "# Report");
+        using var read = _db.CreateContext();
+        var row = await new WeekReportRepository(read).GetByRangeAsync(Start, End);
+        Assert.NotNull(row);
+        Assert.Equal("# Report", row!.Markdown);
+    }
+
+    [Fact]
+    public async Task Upsert_Existing_Overwrites_Markdown()
+    {
+        using (var ctx = _db.CreateContext())
+            await new WeekReportRepository(ctx).UpsertAsync(Start, End, "old");
+        using (var ctx = _db.CreateContext())
+            await new WeekReportRepository(ctx).UpsertAsync(Start, End, "new");
+        using var read = _db.CreateContext();
+        var row = await new WeekReportRepository(read).GetByRangeAsync(Start, End);
+        Assert.Equal("new", row!.Markdown);
+    }
+
+    [Fact]
+    public async Task GetByRange_MissingRange_ReturnsNull()
+    {
+        using var read = _db.CreateContext();
+        Assert.Null(await new WeekReportRepository(read).GetByRangeAsync(Start, End));
+    }
+}