feat: add tui recovery state machine

packages/workflows/src/activities.ts

@@ -14,6 +14,9 @@ export interface DevflowActivityDependencies {
   workspaceRoot: string;
   availableBackends?: readonly BackendConfig[];
   maxConcurrentRuns?: number;
+  recovery?: {
+    maxHungMs?: number;
+  };
   wait?: {
     timeoutMs?: number;
     pollIntervalMs?: number;
@@ -50,6 +53,7 @@ export function createDevflowActivities(
       ...(dependencies.maxConcurrentRuns === undefined
         ? {}
         : { maxConcurrentRuns: dependencies.maxConcurrentRuns }),
+      ...(dependencies.recovery === undefined ? {} : { recovery: dependencies.recovery }),
       ...(activityWait === undefined ? {} : { wait: activityWait }),
     });
   };