feat(worker): accept #123 task numbers as MCP tool input

TaskIdResolver resolves a #123/bare-123 taskId parameter to its GUID
before any lookup, across every External/ MCP tool that takes a task
id, including the batch tools' id arrays (via delegation to the
already-resolving single-entity methods) and update_task's
dependsOnTaskId (empty string still passes through unchanged as the
clear-link sentinel). An unknown number throws a clear error instead
of a silent null. McpToolDocs.TaskNumberHint tells the agent to refer
to tasks as #<number> when reporting to the user, added to the
description of get_task, list_tasks, add_task, update_task_status and
review_task.

src/ClaudeDo.Worker/External/TaskWaitMcpTools.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using ClaudeDo.Data;
+using ClaudeDo.Data.Repositories;
 using Microsoft.EntityFrameworkCore;
 using ModelContextProtocol;
 using ModelContextProtocol.Server;
@@ -71,6 +72,8 @@ public sealed class TaskWaitMcpTools
         if (taskIds.Length == 0)
             throw new ArgumentException("taskIds must not be empty.", nameof(taskIds));
 
+        taskIds = await ResolveIdsAsync(taskIds, cancellationToken);
+
         var timeout = TimeSpan.FromSeconds(Math.Clamp(timeoutSeconds, 1, MaxTimeoutSeconds));
         using var timeoutCts = new CancellationTokenSource(timeout);
         using var linked = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, timeoutCts.Token);
@@ -100,6 +103,16 @@ public sealed class TaskWaitMcpTools
         }
     }
 
+    private async Task<string[]> ResolveIdsAsync(string[] ids, CancellationToken ct)
+    {
+        await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
+        var tasks = new TaskRepository(ctx);
+        var resolved = new string[ids.Length];
+        for (var i = 0; i < ids.Length; i++)
+            resolved[i] = await TaskIdResolver.ResolveAsync(tasks, ids[i], ct);
+        return resolved;
+    }
+
     private async Task<IReadOnlyList<TaskStatusChangeDto>> CheckOnceAsync(
         string[] taskIds, bool treatWaitingForChildrenAsBusy, CancellationToken ct)
     {