Refined self-healing recovery logic for tasks that lack a `fn_task_done` signal, aligned detection in the engine with matching test coverage and architecture documentation for the recovery behavior. Fusion-Task-Id: FN-3962
Refined self-healing recovery logic for tasks that lack a `fn_task_done` signal, aligned detection in the engine with matching test coverage and architecture documentation for the recovery behavior. Fusion-Task-Id: FN-3962