test16 version as base for OOB gravity

README.md

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+# Sable Gravity 0.6.0 test16
+
+Built on the working test13 Sable OBB collision path.
+
+Changes from test15:
+- never imports Sable-mutated world deltaMovement back into local velocity; removes tilted-floor drift;
+- uses Sable local floor contact as the authoritative ground state;
+- keeps creative flight independent from stale world-axis onGround state;
+- captures flight ascend/descend against the exact previous post-tick velocity, so ship rotation cannot become fake acceleration;
+- updates walk animation directly from the actual local displacement because cancelled Player.travel never reaches vanilla calculateEntityAnimation;
+- replaces Sable/vanilla sneak edge backoff with a full local plot-space floor query;
+- leaves Entity.bb axis-aligned only for Minecraft broadphase. It is no longer used as the source of local ground, flight or sneak behaviour.