batch invariance

Reduction order explains the last-bit drift, but a quantized server has a second, much larger leak: a scale computed over the whole batch lets one user's activations change another user's logits. The answer separates the two and fixes both.

Greedy decoding is deterministic on paper and the customer has two different answers in hand. The answer finds where the bits change, shows a measured example of it, and turns the finding into a promise the platform can keep.