feat(data): add Waiting task status and CreatedBy column

- New TaskStatus.Waiting for sequential subtask chains.
- New TaskEntity.CreatedBy column with migration AddTaskCreatedBy.
- TaskRepository.GetByCreatorAsync for filtering by creator.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Data/Configuration/TaskEntityConfiguration.cs

@@ -17,6 +17,7 @@ public class TaskEntityConfiguration : IEntityTypeConfiguration<TaskEntity>
          : v == TaskStatus.Planning ? "planning"
          : v == TaskStatus.Planned ? "planned"
          : v == TaskStatus.Draft ? "draft"
+         : v == TaskStatus.Waiting ? "waiting"
          : throw new ArgumentOutOfRangeException(nameof(v));
 
     private static TaskStatus StatusFromString(string v)
@@ -28,6 +29,7 @@ public class TaskEntityConfiguration : IEntityTypeConfiguration<TaskEntity>
          : v == "planning" ? TaskStatus.Planning
          : v == "planned" ? TaskStatus.Planned
          : v == "draft" ? TaskStatus.Draft
+         : v == "waiting" ? TaskStatus.Waiting
          : throw new ArgumentOutOfRangeException(nameof(v));
 
     private static readonly ValueConverter<TaskStatus, string> StatusConverter =
@@ -64,6 +66,8 @@ public class TaskEntityConfiguration : IEntityTypeConfiguration<TaskEntity>
         builder.Property(t => t.PlanningSessionToken).HasColumnName("planning_session_token");
         builder.Property(t => t.PlanningFinalizedAt).HasColumnName("planning_finalized_at");
 
+        builder.Property(t => t.CreatedBy).HasColumnName("created_by");
+
         builder.HasOne(t => t.Parent)
             .WithMany(t => t.Children)
             .HasForeignKey(t => t.ParentTaskId)

src/ClaudeDo.Data/Migrations/20260424212250_AddTaskCreatedBy.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTaskCreatedBy : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "created_by",
+                table: "tasks",
+                type: "TEXT",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "created_by",
+                table: "tasks");
+        }
+    }
+}

src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs

@@ -82,7 +82,7 @@ namespace ClaudeDo.Data.Migrations
                         {
                             Id = 1,
                             DefaultClaudeInstructions = "",
-                            DefaultMaxTurns = 30,
+                            DefaultMaxTurns = 100,
                             DefaultModel = "sonnet",
                             DefaultPermissionMode = "bypassPermissions",
                             WorktreeAutoCleanupDays = 7,
@@ -236,6 +236,10 @@ namespace ClaudeDo.Data.Migrations
                         .HasColumnType("TEXT")
                         .HasColumnName("created_at");
 
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_by");
+
                     b.Property<string>("Description")
                         .HasColumnType("TEXT")
                         .HasColumnName("description");

src/ClaudeDo.Data/Models/TaskEntity.cs

@@ -10,6 +10,7 @@ public enum TaskStatus
     Planning,
     Planned,
     Draft,
+    Waiting,
 }
 
 public sealed class TaskEntity
@@ -39,6 +40,8 @@ public sealed class TaskEntity
     public string? PlanningSessionToken { get; set; }
     public DateTime? PlanningFinalizedAt { get; set; }
 
+    public string? CreatedBy { get; set; }
+
     // Navigation properties
     public ListEntity List { get; set; } = null!;
     public WorktreeEntity? Worktree { get; set; }

src/ClaudeDo.Data/Repositories/TaskRepository.cs

@@ -75,6 +75,15 @@ public sealed class TaskRepository
     public Task<List<TaskEntity>> GetByListAsync(string listId, CancellationToken ct = default)
         => GetByListIdAsync(listId, ct);
 
+    public async Task<List<TaskEntity>> GetByCreatorAsync(string createdBy, CancellationToken ct = default)
+    {
+        return await _context.Tasks
+            .AsNoTracking()
+            .Where(t => t.CreatedBy == createdBy)
+            .OrderByDescending(t => t.CreatedAt)
+            .ToListAsync(ct);
+    }
+
     #endregion
 
     #region Status transitions