Revert "fix(sandbox/v2): oneshot containers never cleaned up by watcher"

This reverts commit c26d764857.

agent/sandbox/v2/options.go

@@ -64,8 +64,6 @@ func BuildCreateOptions(cfg *types.SandboxConfig, identifier, ownerID, workspace
 	}
 	if opts.IdleTimeout == 0 {
 		switch opts.Policy {
-		case infra.OneShot:
-			opts.IdleTimeout = infra.DefaultOneShotIdleTimeout
 		case infra.Session:
 			opts.IdleTimeout = infra.DefaultSessionIdleTimeout
 		case infra.LongRunning:

sandbox/v2/manager.go

@@ -478,8 +478,6 @@ func (m *Manager) recoverBoxes(ctx context.Context, nodeID string, res *tai.Conn
 			manager:     m,
 		}
 		switch policy {
-		case OneShot:
-			box.idleTimeoutD = DefaultOneShotIdleTimeout
 		case Session:
 			box.idleTimeoutD = DefaultSessionIdleTimeout
 		case LongRunning:

sandbox/v2/types.go

@@ -73,7 +73,6 @@ const (
 
 const (
 	DefaultStopTimeout            = 2 * time.Second
-	DefaultOneShotIdleTimeout     = 30 * time.Minute
 	DefaultSessionIdleTimeout     = 30 * time.Minute
 	DefaultLongRunningIdleTimeout = 2 * time.Hour
 )

sandbox/v2/watcher.go

@@ -86,16 +86,6 @@ func (w *sandboxWatcher) Check(ctx context.Context) []monitor.Alert {
 		}
 
 		switch b.policy {
-		case OneShot:
-			alerts = append(alerts, monitor.Alert{
-				Level:   monitor.Warn,
-				Target:  "box:" + b.id,
-				Message: fmt.Sprintf("oneshot idle expired (idle=%s, timeout=%s), removing", idle.Round(time.Second), timeout),
-				Action: func(ctx context.Context) {
-					mgr.Remove(ctx, b.id)
-				},
-			})
-
 		case Session:
 			alerts = append(alerts, monitor.Alert{
 				Level:   monitor.Warn,