feat(settings): per-model effort and turn presets

ClaudeDo never passed --effort, so every session inherited whatever effortLevel
the user's Claude Code config happened to carry. Settings -> General now holds one
row per model alias (haiku medium/20, sonnet high/30, opus high/40, fable high/25)
supplying the global effort and turn defaults; list- and task-level max-turns
overrides still win, and the agent editor's inherited badge follows the model.

--effort is applied to autonomous runs and to every ConPTY spec (task session,
planning start/resume, ad-hoc, list handler). The model itself is deliberately not
forced on interactive sessions. The single global 'Max turns' field is replaced by
the table, and 'fable' joins ModelRegistry.Aliases.

The migration also adds the is_manual columns used by the next commit.

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -40,7 +40,11 @@ public record AppSettingsDto(
     string? ReportExcludedPaths,
     int StandupWeekday,
     int DailyPrepMaxTasks,
-    List<string>? SessionSkills = null);
+    List<string>? SessionSkills = null,
+    List<ModelPresetDto>? ModelPresets = null);
+
+// Per-model run defaults (effort + turn budget) edited in Settings -> General.
+public record ModelPresetDto(string Model, string Effort, int MaxTurns);
 
 public record SessionSkillDto(
     string Name,
@@ -318,7 +322,9 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
             row.ReportExcludedPaths,
             row.StandupWeekday,
             row.DailyPrepMaxTasks,
-            SkillsFromJson(row.SessionSkills));
+            SkillsFromJson(row.SessionSkills),
+            Data.Models.ModelPresets.Parse(row.ModelPresets)
+                .Select(p => new ModelPresetDto(p.Model, p.Effort, p.MaxTurns)).ToList());
     }
 
     public async Task UpdateAppSettings(AppSettingsDto dto)
@@ -341,6 +347,11 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
             StandupWeekday = dto.StandupWeekday is >= 0 and <= 6 ? dto.StandupWeekday : (int)DayOfWeek.Wednesday,
             DailyPrepMaxTasks = dto.DailyPrepMaxTasks,
             SessionSkills = SkillsToJson(dto.SessionSkills),
+            // Normalized on the way in (unknown models dropped, effort validated, turns clamped).
+            ModelPresets = dto.ModelPresets is { Count: > 0 }
+                ? Data.Models.ModelPresets.Serialize(
+                    dto.ModelPresets.Select(p => new ModelPreset(p.Model, p.Effort, p.MaxTurns)))
+                : Data.Models.ModelPresets.SerializeDefaults(),
         });
     }