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/RunHistoryMcpTools.cs

@@ -21,8 +21,13 @@ public sealed record TaskLogResult(
 public sealed class RunHistoryMcpTools
 {
     private readonly TaskRunRepository _runs;
+    private readonly TaskRepository _tasks;
 
-    public RunHistoryMcpTools(TaskRunRepository runs) => _runs = runs;
+    public RunHistoryMcpTools(TaskRunRepository runs, TaskRepository tasks)
+    {
+        _runs = runs;
+        _tasks = tasks;
+    }
 
     [McpServerTool, Description(
         "List all execution runs for a task — metadata, tokens, turns, result, and error per run — ordered " +
@@ -30,6 +35,7 @@ public sealed class RunHistoryMcpTools
         "get_run to fetch it individually.")]
     public async Task<IReadOnlyList<RunDto>> ListRuns(string taskId, CancellationToken cancellationToken)
     {
+        taskId = await TaskIdResolver.ResolveAsync(_tasks, taskId, cancellationToken);
         var runs = await _runs.GetByTaskIdAsync(taskId, cancellationToken);
         return runs.Select(ToDto).ToList();
     }
@@ -56,6 +62,7 @@ public sealed class RunHistoryMcpTools
         int? limit = null,
         CancellationToken cancellationToken = default)
     {
+        taskId = await TaskIdResolver.ResolveAsync(_tasks, taskId, cancellationToken);
         var run = await _runs.GetLatestByTaskIdAsync(taskId, cancellationToken);
         if (run is null || string.IsNullOrWhiteSpace(run.LogPath) || !File.Exists(run.LogPath))
             return new TaskLogResult(false, [], 0, false);