feat: enforce shared application resource quotas across namespaces

internal/fault/fault.go

@@ -26,6 +26,7 @@ var (
 	IdempotencyConflict = New("IDEMPOTENCY_CONFLICT", "idempotency key was used with different content")
 	Unavailable         = New("UNAVAILABLE", "service temporarily unavailable; retry using the original operation identity")
 	QueueFull           = New("QUEUE_FULL", "queue unfinished task limit reached; retry later using the original identity")
+	ApplicationFull     = New("APPLICATION_FULL", "application unfinished task limit reached; retry later using the original identity")
 )
 
 func Invalid(message string) error { return New("INVALID_ARGUMENT", message) }