Revert "Fix airborne board adjustment retaining pose after stick release"

This reverts commit fd280fd0f1.

docs/board-adjust-neutral.md

@@ -1,25 +0,0 @@
-# Airborne board adjustment release (2026-09-09)
-
-Releasing the right stick could leave the board held in its adjusted pose without
-a grab. `ActionHost::end` only removed the generic `MGIntent`; `BoardAdjust`
-instead publishes `MGIntentMag` and `MGIntentAngle`. A graph exit without another
-Update left these values present, so the motion filters kept targeting the old
-pose.
-
-TU3 evidence: constructor `82BA2A30` stores the authored magnitude and angle
-names at offsets `0x1C` and `0x34`. Vtable `8231E624` selects End `82BA2EB8`,
-which gets the actor's motion-intent map and calls removal `82BC1068` for both
-names (`82BA2F20`, `82BA2F2C`). The Rust End callback now performs those removals.
-
-Stock `MotionGraphIncludes/BoardAdjusts/T_BoardAdjust.xml` already filters missing
-inputs toward zero using `blendOut=0.08`, acceleration limit `0.03` and velocity
-limit `0.2`, and exits to InAir when both absolute filtered values are below
-`0.4` and the directional intent is absent. No filter coefficients changed.
-
-The regression holds the adjustment, ends directly on release with no final
-Update, and runs the stock filter settings. It covers all four output names,
-mirrored angle signs, reentry, and preservation of unrelated motion intents.
-Gameplay appearance remains for user testing; no game was launched.
-
-Validation: the regression failed before the fix with retained values 0.9/0.8;
-all six action-host tests passed after it (release, Windows MSVC, static CRT).