feat(background-agent): handle "interrupt" in notifications, output, and formatting

Update notification systems to display INTERRUPTED status.

Add interrupt handling to background_output tool (terminal status).

Add interrupt-specific status note to formatTaskStatus.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/features/background-agent/background-task-notification-template.ts

@@ -1,6 +1,6 @@
 import type { BackgroundTask } from "./types"
 
-export type BackgroundTaskNotificationStatus = "COMPLETED" | "CANCELLED"
+export type BackgroundTaskNotificationStatus = "COMPLETED" | "CANCELLED" | "INTERRUPTED"
 
 export function buildBackgroundTaskNotificationText(input: {
   task: BackgroundTask

src/features/background-agent/notification-builder.ts

@@ -9,7 +9,7 @@ export function buildBackgroundTaskNotificationText(args: {
 }): string {
   const { task, duration, allComplete, remainingCount, completedTasks } = args
   const statusText =
-    task.status === "completed" ? "COMPLETED" : task.status === "error" ? "ERROR" : "CANCELLED"
+    task.status === "completed" ? "COMPLETED" : task.status === "interrupt" ? "INTERRUPTED" : task.status === "error" ? "ERROR" : "CANCELLED"
   const errorInfo = task.error ? `\n**Error:** ${task.error}` : ""
 
   if (allComplete) {

src/tools/background-task/create-background-output.ts

@@ -92,7 +92,7 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
           return await formatTaskResult(task, client)
         }
 
-        if (task.status === "error" || task.status === "cancelled") {
+        if (task.status === "error" || task.status === "cancelled" || task.status === "interrupt") {
           return formatTaskStatus(task)
         }
 
@@ -113,7 +113,7 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
             return await formatTaskResult(currentTask, client)
           }
 
-          if (currentTask.status === "error" || currentTask.status === "cancelled") {
+           if (currentTask.status === "error" || currentTask.status === "cancelled" || currentTask.status === "interrupt") {
              return formatTaskStatus(currentTask)
            }
         }

src/tools/background-task/modules/background-output.ts

@@ -94,7 +94,7 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
         }
 
          // Error or cancelled: return status immediately
-        if (task.status === "error" || task.status === "cancelled") {
+         if (task.status === "error" || task.status === "cancelled" || task.status === "interrupt") {
            return formatTaskStatus(task)
          }
 
@@ -118,7 +118,7 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
             return await formatTaskResult(currentTask, client)
           }
 
-          if (currentTask.status === "error" || currentTask.status === "cancelled") {
+           if (currentTask.status === "error" || currentTask.status === "cancelled" || currentTask.status === "interrupt") {
              return formatTaskStatus(currentTask)
            }
         }

src/tools/background-task/modules/formatters.ts

@@ -51,6 +51,10 @@ ${truncated}
      statusNote = `
 
 > **Failed**: The task encountered an error. Check the last message for details.`
+   } else if (task.status === "interrupt") {
+     statusNote = `
+
+> **Interrupted**: The task was interrupted by a prompt error. The session may contain partial results.`
    }
 
   const durationLabel = task.status === "pending" ? "Queued for" : "Duration"

src/tools/background-task/task-status-format.ts

@@ -45,6 +45,10 @@ ${truncated}
      statusNote = `
 
 > **Failed**: The task encountered an error. Check the last message for details.`
+   } else if (task.status === "interrupt") {
+     statusNote = `
+
+> **Interrupted**: The task was interrupted by a prompt error. The session may contain partial results.`
    }
 
   const durationLabel = task.status === "pending" ? "Queued for" : "Duration"