Spec deltas

SHALL the polyfill-runtime's single pre-flight send governor take its inter-request rate from the folded GCRA pacing signal, NOT from a fixed launch-jitter floor. When a connector configures both a launch-jitter window and a GCRA pacing hint, the launch-jitter window SHALL be small enough (an ε anti-phase-lock noise band, on the order of tens of milliseconds) that it never exceeds the controller's learned inter-request interval. The send governor's pre-flight wait SHALL be the maximum of the ε-jitter and the pacing delay; since the ε-jitter is bounded well below the slowest learned interval, the learned interval is the binding rate authority whenever the controller has slowed below the ε band.