"Entropy mix-in" is actually just X basis

Turns out that the "hidden dimension" of "maximal entropy" was actually just the alter ego of X basis. Instead of mixing in maximum entropy, we track Z-basis and X-basis dimensions separately as a pair; when we would have "mixed in maximum entropy," we instead mix in X basis with the same ratio. XEB is through the roof, as a result, while L2 distance is still commonly below roughly 1%. (This also implies reversible mechanics, which were previously worried didn't manifest.)

Full Changelog: v9.5.9...v9.5.10

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