refactor(data): centralize list seeding in MigrateAndConfigure, add default-value test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/ClaudeDo.Worker.Tests/UiSchema/TaskEntityFlagsTests.cs

@@ -40,6 +40,25 @@ public class TaskEntityFlagsTests : IDisposable
         Assert.Equal("hello", loaded.Notes);
     }
 
+    [Fact]
+    public async Task Defaults_Are_False_And_Null_When_Not_Set()
+    {
+        await using var ctx = NewContext();
+        var list = new ListEntity { Id = "l1", Name = "L", CreatedAt = DateTime.UtcNow };
+        ctx.Lists.Add(list);
+        ctx.Tasks.Add(new TaskEntity
+        {
+            Id = "t2", ListId = "l1", Title = "T", CreatedAt = DateTime.UtcNow,
+        });
+        await ctx.SaveChangesAsync();
+
+        await using var ctx2 = NewContext();
+        var loaded = await ctx2.Tasks.SingleAsync();
+        Assert.False(loaded.IsStarred);
+        Assert.False(loaded.IsMyDay);
+        Assert.Null(loaded.Notes);
+    }
+
     public void Dispose()
     {
         try { if (File.Exists(_dbPath)) File.Delete(_dbPath); } catch { }