fix(worker): normalize model alias before preset lookup, wire DefaultMaxTurns as fallback

A full model id like claude-sonnet-4-6 in list_config.model never matched any
ModelPresets row (only bare aliases did), so every run under it landed on the
hardcoded 30-turn/DefaultLevel fallback instead of the sonnet preset row -
this is what killed two autonomous tasks at the 30-turn limit.

ModelRegistry.TryNormalizeAlias (non-throwing: exact match, then substring
match against a full model id) lets ModelPresets.For resolve a full model id
to its alias's preset row. For a model that still doesn't resolve, the
hardcoded 30 is replaced by a caller-supplied fallbackMaxTurns, and TaskRunner
now passes AppSettings.DefaultMaxTurns there - so that setting has a real
effect instead of being dead, matching the direction already noted in
docs/open.md.

tests/ClaudeDo.Worker.Tests/Runner/ModelResolutionWireTests.cs

@@ -0,0 +1,111 @@
+using ClaudeDo.Data;
+using ClaudeDo.Data.Git;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Config;
+using ClaudeDo.Worker.Hub;
+using ClaudeDo.Worker.Runner;
+using ClaudeDo.Worker.Tests.Infrastructure;
+using Microsoft.Extensions.Logging.Abstractions;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+using Xunit;
+
+namespace ClaudeDo.Worker.Tests.Runner;
+
+/// Verifies ResolveConfigAsync's model → preset resolution reaches the CLI args: a full
+/// model id must hit its alias's preset row (not the hardcoded unknown-model fallback), and
+/// an unknown model must still start a run, falling back no harder than AppSettings.DefaultMaxTurns.
+public sealed class ModelResolutionWireTests : IDisposable
+{
+    private readonly DbFixture _db = new();
+    private readonly string _tempDir;
+    private readonly WorkerConfig _cfg;
+
+    public ModelResolutionWireTests()
+    {
+        _tempDir = Path.Combine(Path.GetTempPath(), $"cd_modelwire_{Guid.NewGuid():N}");
+        Directory.CreateDirectory(_tempDir);
+        _cfg = new WorkerConfig { SandboxRoot = _tempDir, LogRoot = _tempDir };
+    }
+
+    public void Dispose() { _db.Dispose(); try { Directory.Delete(_tempDir, true); } catch { } }
+
+    private (TaskRunner Runner, IReadOnlyList<string> Args) BuildRunnerCapturingArgs(out Func<IReadOnlyList<string>> getArgs)
+    {
+        var dbFactory = _db.CreateFactory();
+        var state = TaskStateServiceBuilder.Build(dbFactory).State;
+        var wt = new WorktreeManager(new GitService(), dbFactory, _cfg, NullLogger<WorktreeManager>.Instance);
+        IReadOnlyList<string>? captured = null;
+        var fake = new FakeClaudeProcess((_, _, args, _, _) =>
+        {
+            captured = args;
+            return Task.FromResult(new RunResult { ExitCode = 0, ResultMarkdown = "ok" });
+        });
+        var runner = new TaskRunner(fake, dbFactory, new HubBroadcaster(new CapturingHubContext()), wt,
+            new ClaudeArgsBuilder(), _cfg, NullLogger<TaskRunner>.Instance, state, new TaskRunTokenRegistry(),
+            new AttachmentStore(), new FakeSessionSkillSeeder());
+        getArgs = () => captured!;
+        return (runner, Array.Empty<string>());
+    }
+
+    private async Task SeedTaskAsync(string listModel)
+    {
+        using var ctx = _db.CreateContext();
+        ctx.Lists.Add(new ListEntity { Id = "l1", Name = "L", WorkingDir = null, CreatedAt = DateTime.UtcNow });
+        ctx.ListConfigs.Add(new ListConfigEntity { ListId = "l1", Model = listModel });
+        ctx.Tasks.Add(new TaskEntity
+        {
+            Id = "t1", ListId = "l1", Title = "Task", Status = TaskStatus.Idle, CreatedAt = DateTime.UtcNow,
+        });
+        await ctx.SaveChangesAsync();
+    }
+
+    [Fact]
+    public async Task Full_model_id_resolves_to_its_alias_preset_row()
+    {
+        await SeedTaskAsync(listModel: "claude-sonnet-4-6");
+        var (runner, _) = BuildRunnerCapturingArgs(out var getArgs);
+
+        using (var ctx = _db.CreateContext())
+            await runner.RunAsync((await new TaskRepository(ctx).GetByIdAsync("t1"))!, "slot-1", CancellationToken.None);
+
+        var args = getArgs().ToList();
+        var sonnetPreset = ModelPresets.For(ModelPresets.Defaults, "sonnet");
+
+        Assert.Contains("--effort", args);
+        Assert.Equal(sonnetPreset.Effort, args[args.IndexOf("--effort") + 1]);
+        Assert.Contains("--max-turns", args);
+        Assert.Equal(sonnetPreset.MaxTurns.ToString(), args[args.IndexOf("--max-turns") + 1]);
+    }
+
+    [Fact]
+    public async Task Unknown_model_still_starts_a_run_and_uses_the_global_default_max_turns()
+    {
+        await SeedTaskAsync(listModel: "totally-unrecognized-model");
+        var (runner, _) = BuildRunnerCapturingArgs(out var getArgs);
+
+        using (var ctx = _db.CreateContext())
+        {
+            var settingsRepo = new AppSettingsRepository(ctx);
+            var settings = await settingsRepo.GetAsync();
+            settings.DefaultMaxTurns = 100;
+            await ctx.SaveChangesAsync();
+        }
+
+        Exception? thrown = null;
+        try
+        {
+            using var ctx = _db.CreateContext();
+            await runner.RunAsync((await new TaskRepository(ctx).GetByIdAsync("t1"))!, "slot-1", CancellationToken.None);
+        }
+        catch (Exception ex)
+        {
+            thrown = ex;
+        }
+
+        Assert.Null(thrown);
+        var args = getArgs().ToList();
+        Assert.Contains("--max-turns", args);
+        Assert.Equal("100", args[args.IndexOf("--max-turns") + 1]);
+    }
+}