fix(worker): surface the real reason a Claude run failed instead of a generic exit-code message

StreamAnalyzer now reads subtype/terminal_reason/errors from the CLI's result
event, and TaskRunner builds a specific ErrorMarkdown from them: max_turns names
the turn budget and points at set_task_config + requeue, api_error passes
through the provider's own message (which carries the reset time), and any
other terminal_reason is appended to the previous generic text instead of
staying invisible. Falls through to the old "exited with code N and no result"
text when there's no terminal_reason at all (a real crash).

src/ClaudeDo.Worker/Runner/RunResult.cs

@@ -1,6 +1,6 @@
 namespace ClaudeDo.Worker.Runner;
 
-public sealed class RunResult
+public sealed record RunResult
 {
     public required int ExitCode { get; init; }
     public string? ResultMarkdown { get; init; }
@@ -11,6 +11,9 @@ public sealed class RunResult
     public int TokensIn { get; init; }
     public int TokensOut { get; init; }
     public IReadOnlyList<string> Blocks { get; init; } = Array.Empty<string>();
+    public string? ResultSubtype { get; init; }
+    public string? TerminalReason { get; init; }
+    public IReadOnlyList<string> Errors { get; init; } = Array.Empty<string>();
 
     public bool IsSuccess => ExitCode == 0 && ResultMarkdown is not null;
 }