feat: surface workflow diagnostics

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/sidecar/runTurnPending.ts

@@ -15,6 +15,7 @@ import type {
   AssistantUsageEvent,
   AssistantIntentEvent,
   ReasoningDeltaEvent,
+  WorkflowDiagnosticEvent,
 } from '@shared/contracts/sidecar';
 import type { ChatMessageRecord } from '@shared/domain/session';
 
@@ -27,7 +28,8 @@ export type TurnScopedEvent =
   | PendingMessagesModifiedEvent
   | AssistantUsageEvent
   | AssistantIntentEvent
-  | ReasoningDeltaEvent;
+  | ReasoningDeltaEvent
+  | WorkflowDiagnosticEvent;
 
 export interface RunTurnPendingCommand {
   kind: 'run-turn';

src/main/sidecar/sidecarProcess.ts

@@ -454,6 +454,7 @@ export class SidecarClient {
       case 'session-usage':
       case 'session-compaction':
       case 'pending-messages-modified':
+      case 'workflow-diagnostic':
       case 'assistant-usage':
       case 'assistant-intent':
       case 'reasoning-delta':