Default IActiveTaskTracker that does nothing. Used when no tracker has
been registered — fine for headless / server-side consumers that don't render
task UI. Returns false from RemoveByAgentRunId to signal "nothing was
tracked," which is the truthful answer in a no-op world.
Default IActiveTaskTracker that does nothing. Used when no tracker has been registered — fine for headless / server-side consumers that don't render task UI. Returns
falsefromRemoveByAgentRunIdto signal "nothing was tracked," which is the truthful answer in a no-op world.