feat(worker): week report prompt builder (day-major pivot)

tests/ClaudeDo.Worker.Tests/Report/WeekReportPromptBuilderTests.cs

@@ -0,0 +1,37 @@
+using ClaudeDo.Worker.Report;
+
+namespace ClaudeDo.Worker.Tests.Report;
+
+public class WeekReportPromptBuilderTests
+{
+    [Fact]
+    public void Build_IsDayMajor_AndIncludesNotesAndInstructions()
+    {
+        var repoA = new RepoActivity { RepoPath = @"C:\Dev\App" };
+        var d1 = new DayActivity { Date = new DateOnly(2026, 6, 1) };
+        d1.Prompts.Add("Add login");
+        d1.Summaries.Add("Implemented login");
+        repoA.Days.Add(d1);
+        var d2 = new DayActivity { Date = new DateOnly(2026, 6, 2) };
+        d2.Prompts.Add("Fix bug");
+        repoA.Days.Add(d2);
+
+        var notes = new Dictionary<DateOnly, List<string>>
+        {
+            [new DateOnly(2026, 6, 1)] = new() { "Standup um 9" },
+        };
+
+        var prompt = WeekReportPromptBuilder.Build(
+            new DateOnly(2026, 5, 28), new DateOnly(2026, 6, 3),
+            new[] { repoA }, notes);
+
+        Assert.Contains("Write the ENTIRE report in German", prompt);
+        var idxJun1 = prompt.IndexOf("2026-06-01", StringComparison.Ordinal);
+        var idxJun2 = prompt.IndexOf("2026-06-02", StringComparison.Ordinal);
+        Assert.True(idxJun1 >= 0 && idxJun2 > idxJun1);
+        Assert.Contains("Add login", prompt);
+        Assert.Contains("Implemented login", prompt);
+        Assert.Contains("Standup um 9", prompt);
+        Assert.Contains(@"C:\Dev\App", prompt);
+    }
+}