fix(data): address code review findings

- Fix sort order regression in GetByListIdAsync (was descending, should be ascending)
- Restore WAL mode pragma (was silently dropped in EF migration)
- Add existing-DB compatibility shim in MigrateAndConfigure (baselines InitialCreate
  migration for databases created by the old schema.sql)
- Remove dead AddDbContext/AddScoped registrations from Worker (only IDbContextFactory
  is used by singleton consumers)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Data/ClaudeDoDbContext.cs

@@ -1,5 +1,7 @@
 using ClaudeDo.Data.Models;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage;
 
 namespace ClaudeDo.Data;
 
@@ -19,4 +21,44 @@ public class ClaudeDoDbContext : DbContext
     {
         modelBuilder.ApplyConfigurationsFromAssembly(typeof(ClaudeDoDbContext).Assembly);
     }
+
+    /// <summary>
+    /// Applies EF Core migrations and sets WAL mode. Safe for both fresh and existing databases.
+    /// Existing databases (created by the old schema.sql) have their tables but no
+    /// __EFMigrationsHistory — this method detects that case and baselines the initial
+    /// migration so EF skips re-creating tables that already exist.
+    /// </summary>
+    public static void MigrateAndConfigure(ClaudeDoDbContext db)
+    {
+        // If the 'lists' table exists but __EFMigrationsHistory does not,
+        // this is a pre-EF database. Baseline the InitialCreate migration.
+        var conn = db.Database.GetDbConnection();
+        conn.Open();
+        using (var cmd = conn.CreateCommand())
+        {
+            cmd.CommandText = "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='lists'";
+            var hasLists = Convert.ToInt64(cmd.ExecuteScalar()) > 0;
+
+            cmd.CommandText = "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='__EFMigrationsHistory'";
+            var hasHistory = Convert.ToInt64(cmd.ExecuteScalar()) > 0;
+
+            if (hasLists && !hasHistory)
+            {
+                // Create the history table and mark InitialCreate as applied.
+                cmd.CommandText = """
+                    CREATE TABLE "__EFMigrationsHistory" (
+                        "MigrationId" TEXT NOT NULL CONSTRAINT "PK___EFMigrationsHistory" PRIMARY KEY,
+                        "ProductVersion" TEXT NOT NULL
+                    );
+                    INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
+                    VALUES ('20260416064948_InitialCreate', '8.0.11');
+                    """;
+                cmd.ExecuteNonQuery();
+            }
+        }
+        conn.Close();
+
+        db.Database.Migrate();
+        db.Database.ExecuteSqlRaw("PRAGMA journal_mode=WAL");
+    }
 }

src/ClaudeDo.Data/Repositories/TaskRepository.cs

@@ -38,7 +38,7 @@ public sealed class TaskRepository
     {
         return await _context.Tasks
             .Where(t => t.ListId == listId)
-            .OrderByDescending(t => t.CreatedAt)
+            .OrderBy(t => t.CreatedAt)
             .ToListAsync(ct);
     }