diff --git a/crates/skate-core/src/player/offboard/controller/tests.rs b/crates/skate-core/src/player/offboard/controller/tests.rs
index 58c7f9fe..d61037ee 100644
--- a/crates/skate-core/src/player/offboard/controller/tests.rs
+++ b/crates/skate-core/src/player/offboard/controller/tests.rs
@@ -86,6 +86,20 @@ fn constructor_uses_clip_metrics_and_original_initial_fields() {
     assert_eq!(s.motion.target_scale_784, -1.0);
     assert_eq!(s.cadence.phase.duration, None);
 }
+
+#[test]
+fn tiny_velocity_delta_keeps_ground_publication_finite() {
+    let mut controller = Controller::new(settings(), metrics());
+    controller.state.motion.velocity_480 = [0.0, 1.0e-21, 1.0, 0.0];
+    controller.state.motion.speed_704 = 1.0;
+    let result = controller.step_ground(&job());
+    assert!(result.position.into_iter().all(f32::is_finite));
+    assert!(result.velocity.into_iter().all(f32::is_finite));
+    assert!(result.physical_frame.into_iter().flatten().all(f32::is_finite));
+    assert!(result.animation_frame.into_iter().flatten().all(f32::is_finite));
+    assert!(controller.state.surface.lean.into_iter().all(f32::is_finite));
+    assert!(controller.state.cadence.phase.phase.is_finite());
+}
 #[test]
 fn absent_clip_queries_have_original_zero_speed() {
     let s = State::new([None; 3]);
diff --git a/crates/skate-core/src/player/offboard/movement_velocity/math.rs b/crates/skate-core/src/player/offboard/movement_velocity/math.rs
index 6be7e536..3d20a9b5 100644
--- a/crates/skate-core/src/player/offboard/movement_velocity/math.rs
+++ b/crates/skate-core/src/player/offboard/movement_velocity/math.rs
@@ -10,13 +10,22 @@ pub(super) fn scale(a: Vector, s: f32) -> Vector { a.map(|v| v * s) }
 pub(super) fn sub(a: Vector, b: Vector) -> Vector { std::array::from_fn(|i| a[i] - b[i]) }
 pub(super) fn madd(a: Vector, s: f32, b: Vector) -> Vector { std::array::from_fn(|i| a[i].mul_add(s, b[i])) }
 fn inverse_squared(value: f32) -> f32 {
+    // The portable estimate preserves subnormals. For a tiny positive squared
+    // length, r*r can overflow even though both the length and inverse root
+    // are finite. Normalize its exponent before the recovered refinements;
+    // rsqrt(x * 2^24) * 2^12 = rsqrt(x). Normal inputs keep their old path.
+    let (value, rescale) = if value > 0.0 && value.is_subnormal() {
+        (value * 16_777_216.0, 4096.0)
+    } else {
+        (value, 1.0)
+    };
     //PC seed is not bit-exact Xenon; retain both original refinement stages.
     let mut r = crate::physics::reciprocal_sqrt::estimate(value);
     for _ in 0..2 {
         let error = (-value).mul_add(r * r, 1.0);
         r = (r * 0.5).mul_add(error, r);
     }
-    r
+    r * rescale
 }
 pub(super) fn length(v: Vector) -> f32 {
     let squared = dot(v, v);
diff --git a/crates/skate-core/src/player/offboard/movement_velocity/tests.rs b/crates/skate-core/src/player/offboard/movement_velocity/tests.rs
index e0aa7a05..7f09e6fe 100644
--- a/crates/skate-core/src/player/offboard/movement_velocity/tests.rs
+++ b/crates/skate-core/src/player/offboard/movement_velocity/tests.rs
@@ -1,4 +1,49 @@
 use super::*;
+
+#[test]
+fn tiny_velocity_delta_remains_finite_and_reaches_target() {
+    // Flat-ground convergence can leave a tiny vertical correction while X/Z
+    // already match. Its squared length is positive but subnormal.
+    let current = [-1.6481168, 1.0e-21, 5.7692037, 0.0];
+    let target = [-1.6481168, 0.0, 5.7692037, 0.0];
+    let delta = sub(target, current);
+    assert!(dot(delta, delta).is_subnormal());
+    let result = limit_delta(target, current, 0.2);
+    assert_eq!(result, target);
+    assert!(length(delta).is_finite());
+    assert!((length(delta) / 1.0e-21 - 1.0).abs() < 0.001);
+}
+
+#[test]
+fn tiny_velocity_refinement_boundaries_preserve_limits_and_invalid_inputs() {
+    for exponent in -74..=-60 {
+        let component = 2.0f32.powi(exponent);
+        let delta = [component, 0.0, 0.0, 0.0];
+        let measured = length(delta);
+        assert!(measured.is_finite() && measured > 0.0);
+        assert!((measured / component - 1.0).abs() < 1e-6);
+        let maximum = component * 0.5;
+        let limited = limit_delta(delta, [0.0; 4], maximum);
+        assert!(limited.into_iter().all(f32::is_finite));
+        assert!((limited[0] / maximum - 1.0).abs() < 1e-6);
+    }
+    assert_eq!(length([0.0; 4]), 0.0);
+    assert!(length([f32::NAN, 0.0, 0.0, 0.0]).is_nan());
+    assert!(limit_delta([f32::NAN, 0.0, 0.0, 0.0], [0.0; 4], 0.2)[0].is_nan());
+}
+
+#[test]
+fn tiny_velocity_correction_does_not_poison_walking_state() {
+    let mut state = State { velocity: [0.0, 1.0e-21, 5.0, 0.0], speed: 5.0, ..State::default() };
+    let mut input = input();
+    input.steering = 0.0;
+    for _ in 0..120 {
+        state.update(&settings(), &input);
+        assert_eq!(state.velocity, [0.0, 0.0, 5.0, 0.0]);
+        assert_eq!(state.speed, 5.0);
+        assert!(state.forward_delta.is_finite() && state.right_delta.is_finite());
+    }
+}
 fn curve(value: f32) -> PointGraph<8> { PointGraph { x: std::array::from_fn(|i| i as f32), y: [value; 8] } }
 fn settings() -> Settings {
     Settings { slope_speed_scalar: curve(1.0), slope_mode_speed: curve(3.0), turn_vs_speed: curve(90.0), turn_delta_vs_speed: curve(15.0) }
diff --git a/crates/skate-game/src/graph_host/action.rs b/crates/skate-game/src/graph_host/action.rs
index 433a67db..fdd7856b 100644
--- a/crates/skate-game/src/graph_host/action.rs
+++ b/crates/skate-game/src/graph_host/action.rs
@@ -12,7 +12,8 @@ use skate_core::graph::{
 };
 use skate_core::input::body_flip_signal;
 use skate_core::input::graph_intents::{CreateMgIntent, IntentMutation};
-use skate_core::input::graph_intents::apply_filter;
+#[path = "action_board_adjust.rs"]
+mod board_adjust;
 use skate_data::collections::Collections;
 use super::outputs::{ActionGraphInput, ActionGraphOutput, GraphCapabilityReport, GraphDiagnostics};
 
@@ -44,6 +45,7 @@ pub struct ActionHost {
     created: Vec<bool>,
     const_handlers: Vec<ConstMgIntent>,
     time_handlers: Vec<TimeMgIntent>,
+    board_adjust: Vec<board_adjust::State>,
     body_flip: Vec<body_flip_signal::State>,
     body_flip_settings: Option<body_flip_signal::Settings>,
     /// JuiceHook instance+8 starts with the native null intent name. Its
@@ -148,6 +150,7 @@ impl ActionHost {
             created: vec![false; count],
             const_handlers,
             time_handlers,
+            board_adjust: vec![board_adjust::State::default(); count],
             body_flip: vec![body_flip_signal::State::default(); count],
             body_flip_settings: None,
             juice_pending: vec![String::new(); count],
@@ -201,7 +204,7 @@ impl ActionHost {
         }
     }
 
-    fn publish_board_adjust(&mut self, instance: &ActionInstance) {
+    fn publish_board_adjust(&mut self, behavior: BehaviorId, instance: &ActionInstance) {
         let Some(magnitude_name) = instance.config.mg_intent_mag.as_deref() else {
             return;
         };
@@ -209,21 +212,16 @@ impl ActionHost {
             return;
         };
 
-        if let Some(value) = self.action_intents.get("BoardAdjustMag").copied() {
-            self.motion_intents.insert(magnitude_name, value);
+        if let Some((magnitude, angle)) = self.board_adjust[behavior].update(
+            self.action_intents.get("BoardAdjustMag").copied(),
+            self.action_intents.get("BoardAdjustAngle").copied(),
+            instance.config.angle_filter, instance.config.negate_on_mirror,
+            self.stance.is_some_and(|(_, mirrored)| mirrored),
+        ) {
+            self.motion_intents.insert(magnitude_name, magnitude);
+            self.motion_intents.insert(angle_name, angle);
         } else {
             self.motion_intents.remove(magnitude_name);
-        }
-
-        if let Some(mut value) = self.action_intents.get("BoardAdjustAngle").copied() {
-            if instance.config.angle_filter != 0 {
-                value = apply_filter(value, instance.config.angle_filter);
-            }
-            if instance.config.negate_on_mirror && self.stance.is_some_and(|(_, mirrored)| mirrored) {
-                value = -value;
-            }
-            self.motion_intents.insert(angle_name, value);
-        } else {
             self.motion_intents.remove(angle_name);
         }
     }
@@ -317,7 +315,7 @@ impl Host for ActionHost {
             return;
         }
         if let ActionOperation::BoardAdjust = instance.operation {
-            self.publish_board_adjust(&instance);
+            self.board_adjust[behavior].begin();
             return;
         }
         if let ActionOperation::CreateConstMgIntent = instance.operation {
@@ -391,7 +389,7 @@ impl Host for ActionHost {
             return;
         }
         if let ActionOperation::BoardAdjust = instance.operation {
-            self.publish_board_adjust(&instance);
+            self.publish_board_adjust(behavior, &instance);
             return;
         }
         if let ActionOperation::CreateConstMgIntent = instance.operation {
@@ -429,6 +427,14 @@ impl Host for ActionHost {
         let Some(instance) = self.operation(behavior).cloned() else {
             return;
         };
+        if matches!(instance.operation, ActionOperation::BoardAdjust) {
+            //82BA2EB8: remove both authored names; End does not reset state.
+            for name in [instance.config.mg_intent_mag.as_deref(),
+                         instance.config.mg_intent_angle.as_deref()].into_iter().flatten() {
+                self.motion_intents.remove(name);
+            }
+            return;
+        }
         if matches!(instance.operation, ActionOperation::CreateTrickIntentFromGesture { .. }) {
             self.trick_handlers[behavior].end(&mut self.motion_intents);
             return;
diff --git a/crates/skate-game/src/graph_host/action_board_adjust.rs b/crates/skate-game/src/graph_host/action_board_adjust.rs
new file mode 100644
index 00000000..e793f8b1
--- /dev/null
+++ b/crates/skate-game/src/graph_host/action_board_adjust.rs
@@ -0,0 +1,39 @@
+//! TU3 BoardAdjust instance+8/+12, Begin82BA2BA8, Update82BA2BC8.
+#[derive(Clone, Copy, Debug, Default)]
+pub(super) struct State {
+    wrap: u32,
+    previous_angle: f32,
+}
+
+impl State {
+    pub fn begin(&mut self) { *self = Self::default(); }
+
+    pub fn update(&mut self, magnitude: Option<f32>, angle: Option<f32>, filter: u32,
+                  negate_on_mirror: bool, mirrored: bool) -> Option<(f32, f32)> {
+        let (Some(magnitude), Some(mut angle)) = (magnitude, angle) else {
+            //82BA2E88: remove both outputs and reset both instance fields.
+            self.begin();
+            return None;
+        };
+        if filter <= 7 { angle = skate_core::input::graph_intents::apply_filter(angle, filter); }
+        if negate_on_mirror && mirrored { angle *= -1.0; }
+        //82BA2D70: crossing the +/-pi seam retains the previous side until
+        //the raw angle crosses back. Test the previous RAW angle, not output.
+        let crossed = self.previous_angle * angle < 0.0
+            && self.previous_angle.abs() > f32::from_bits(0x3fc90fdb);
+        match self.wrap {
+            0 if crossed && self.previous_angle < 0.0 => self.wrap = 1,
+            0 if crossed && self.previous_angle > 0.0 => self.wrap = 2,
+            1 if crossed && self.previous_angle > 0.0 => self.wrap = 0,
+            2 if crossed && self.previous_angle < 0.0 => self.wrap = 0,
+            _ => {}
+        }
+        self.previous_angle = angle;
+        let output = match self.wrap {
+            1 => f32::from_bits(0xc0490fdb), //822F8908
+            2 => f32::from_bits(0x40490fdb), //82060C44
+            _ => angle,
+        };
+        Some((magnitude, output))
+    }
+}
diff --git a/crates/skate-game/src/graph_host/action_nodes.rs b/crates/skate-game/src/graph_host/action_nodes.rs
index aca4f94e..4110bb38 100644
--- a/crates/skate-game/src/graph_host/action_nodes.rs
+++ b/crates/skate-game/src/graph_host/action_nodes.rs
@@ -52,7 +52,8 @@ impl Parameter {
                 filter(attributes.text("mirrorFilter")),
             ],
             angle_filter: filter(attributes.text("angleFilter")),
-            negate_on_mirror: attributes.boolean_byte("negateOnMirror", 0) != 0,
+            //BoardAdjust82BA2A90 passes true as the constructor default.
+            negate_on_mirror: attributes.boolean_byte("negateOnMirror", 1) != 0,
         }
     }
 }
diff --git a/crates/skate-game/src/graph_host/mod.rs b/crates/skate-game/src/graph_host/mod.rs
index e2fd209c..0d361e43 100644
--- a/crates/skate-game/src/graph_host/mod.rs
+++ b/crates/skate-game/src/graph_host/mod.rs
@@ -30,6 +30,7 @@ pub(crate) mod motion_ground_slope;
 pub(crate) mod motion_hand_services;
 mod motion_hooks;
 mod motion_hippy_jump;
+mod motion_finger_flip;
 pub(crate) mod motion_intent_filter;
 mod motion_kickturn;
 pub(crate) mod motion_landing;
diff --git a/crates/skate-game/src/graph_host/motion.rs b/crates/skate-game/src/graph_host/motion.rs
index 0110a7fd..717e15bd 100644
--- a/crates/skate-game/src/graph_host/motion.rs
+++ b/crates/skate-game/src/graph_host/motion.rs
@@ -114,6 +114,7 @@ pub struct MotionHost {
     pub physical_stance: Option<(bool, bool)>,
     pub flags: super::motion_landing::Flags,
     hippy_jump: super::motion_hippy_jump::Settings,
+    finger_flip: super::motion_finger_flip::Settings,
     pub landing_physical: Option<super::motion_landing::Physical>,
     pub wipeout_physical: Option<super::motion_wipeout::Physical>,
     pub wipeout_controls: super::motion_wipeout::Controls,
@@ -290,6 +291,7 @@ impl MotionHost {
             kickturn: super::motion_kickturn::load_settings(data)?,
             manual: super::motion_manual::settings(data)?,
             hippy_jump: super::motion_hippy_jump::Settings::load(data)?,
+            finger_flip: super::motion_finger_flip::Settings::load(data)?,
             next_instance: 1,
         })
     }
@@ -424,3 +426,11 @@ mod jump_into_tests;
 #[cfg(test)]
 #[path = "tests/motion_deck_angles.rs"]
 mod deck_angles_tests;
+
+#[cfg(test)]
+#[path = "tests/motion_finger_flip.rs"]
+mod finger_flip_tests;
+
+#[cfg(test)]
+#[path = "tests/motion_board_adjust.rs"]
+mod board_adjust_tests;
diff --git a/crates/skate-game/src/graph_host/motion_execute_leaf.rs b/crates/skate-game/src/graph_host/motion_execute_leaf.rs
index 104fe461..b4a08cff 100644
--- a/crates/skate-game/src/graph_host/motion_execute_leaf.rs
+++ b/crates/skate-game/src/graph_host/motion_execute_leaf.rs
@@ -290,6 +290,23 @@ pub(super) fn execute(
                 // matching conditions; the authored node itself must still
                 // advance that lifecycle instead of aborting graph execution.
                 match operation {
+                    crate::graph_host::motion_stock_gameplay::Operation::FingerFlipOut { grab_intent } => {
+                        let Instance::FingerFlipOut(state) = instance else {
+                            return Err("FingerFlipOut operation/instance mismatch".into());
+                        };
+                        if phase == 0 {
+                            state.begin();
+                        } else if phase == 1 {
+                            let value = state.update(
+                                host.animation.motion_intents.contains_key(&grab_intent),
+                                frame.dt, &host.finger_flip,
+                            );
+                            host.animation.set_attribute(SettableAttribute {
+                                name: encode(b"Grabbing"), value,
+                                normalized: false, sequence_id: -1,
+                            });
+                        }
+                    }
                     crate::graph_host::motion_stock_gameplay::Operation::MatchAirTime => {
                         let Instance::MatchAirTime(state) = instance else {
                             return Err("MatchAirTime operation/instance mismatch".into());
diff --git a/crates/skate-game/src/graph_host/motion_finger_flip.rs b/crates/skate-game/src/graph_host/motion_finger_flip.rs
new file mode 100644
index 00000000..d7bc6213
--- /dev/null
+++ b/crates/skate-game/src/graph_host/motion_finger_flip.rs
@@ -0,0 +1,81 @@
+//! FingerFlipOut: TU3 Begin82BB3198, Update82BB7C40, empty End82B61BB8.
+use skate_core::point_graph::PointGraph;
+use skate_data::collections::Collections;
+
+pub(super) struct Settings {
+    minimum: f32,
+    maximum: f32,
+    curve: PointGraph<8>,
+}
+
+impl Settings {
+    pub(super) fn load(data: &Collections) -> Result<Self, String> {
+        // GlobalAttributeCollection164 is selected at8289FD10..30. The
+        // anim_motion schema places this PointNegGraphData8 field at190.
+        // Preserve numeric identities because the retail vault omits names.
+        let words = data.words::<20>(
+            "anim_motion", "Hash_41DB0C4F82003A15", "Hash_E0C1407B688858AD",
+        )?;
+        let minimum = f32::from_bits(words[0]);
+        let maximum = f32::from_bits(words[2]);
+        if !minimum.is_finite() || !maximum.is_finite() || minimum > maximum {
+            return Err("FingerFlipOut has invalid stock timer bounds".into());
+        }
+        Ok(Self {
+            minimum,
+            maximum,
+            curve: PointGraph {
+                x: std::array::from_fn(|i| f32::from_bits(words[4 + i])),
+                y: std::array::from_fn(|i| f32::from_bits(words[12 + i])),
+            },
+        })
+    }
+}
+
+#[derive(Default)]
+pub(super) struct State {
+    elapsed: f32,
+}
+
+impl State {
+    pub(super) fn begin(&mut self) {
+        self.elapsed = 0.0;
+    }
+
+    pub(super) fn update(&mut self, grab_present: bool, dt: f32, settings: &Settings) -> f32 {
+        //82454FD8 tests membership, including a zero-valued intent. The time
+        //service supplies dt; this is not the magnitude of the grab input.
+        self.elapsed = if grab_present { self.elapsed - dt } else { self.elapsed + dt };
+        self.elapsed = self.elapsed.clamp(settings.minimum, settings.maximum);
+        settings.curve.evaluate(self.elapsed)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn finger_flip_release_regrab_bounds_and_reentry() {
+        let settings = Settings {
+            minimum: 0.0,
+            maximum: 0.5,
+            curve: PointGraph {
+                x: std::array::from_fn(|i| i as f32 / 14.0),
+                y: std::array::from_fn(|i| 1.0 - i as f32 / 7.0),
+            },
+        };
+        let mut state = State::default();
+        state.begin();
+        assert_eq!(state.update(true, 0.25, &settings), 1.0);
+        assert!((state.update(false, 0.125, &settings) - 0.75).abs() < 1e-6);
+        assert!((state.update(false, 0.125, &settings) - 0.5).abs() < 1e-6);
+        assert!((state.update(true, 0.125, &settings) - 0.75).abs() < 1e-6);
+        assert_eq!(state.update(false, 1.0, &settings), 0.0);
+        assert_eq!(state.update(false, 1.0, &settings), 0.0);
+        assert_eq!(state.elapsed, 0.5);
+        state.begin();
+        assert_eq!(state.elapsed, 0.0);
+        assert_eq!(state.update(true, 0.25, &settings), 1.0);
+    }
+}
diff --git a/crates/skate-game/src/graph_host/motion_instances.rs b/crates/skate-game/src/graph_host/motion_instances.rs
index 724e36b6..916ede9a 100644
--- a/crates/skate-game/src/graph_host/motion_instances.rs
+++ b/crates/skate-game/src/graph_host/motion_instances.rs
@@ -31,6 +31,7 @@ pub(super) enum Instance {
     Shove(super::super::motion_shove::ShoveState),
     SetManualAngle(skate_core::animation::manual::State),
     HippyJumpAntic(super::super::motion_hippy_jump::State),
+    FingerFlipOut(super::super::motion_finger_flip::State),
     ///82BB5930 initializes byte8 once per allocated behavior instance.
     JumpInto { first_update: bool },
 }
@@ -95,6 +96,9 @@ impl Instance {
             MotionOperation::StockGameplay(
                 super::super::motion_stock_gameplay::Operation::HippyJumpAntic,
             ) => Self::HippyJumpAntic(Default::default()),
+            MotionOperation::StockGameplay(
+                super::super::motion_stock_gameplay::Operation::FingerFlipOut { .. },
+            ) => Self::FingerFlipOut(Default::default()),
             MotionOperation::StockGameplay(
                 super::super::motion_stock_gameplay::Operation::JumpInto { .. },
             ) => Self::JumpInto { first_update: true },
diff --git a/crates/skate-game/src/graph_host/motion_stock_gameplay.rs b/crates/skate-game/src/graph_host/motion_stock_gameplay.rs
index 269f0e6a..34da0b0b 100644
--- a/crates/skate-game/src/graph_host/motion_stock_gameplay.rs
+++ b/crates/skate-game/src/graph_host/motion_stock_gameplay.rs
@@ -146,7 +146,7 @@ pub enum Operation {
         attribute_y: AttributeName,
     },
     FootPlantAbsorb,
-    FingerFlipOut,
+    FingerFlipOut { grab_intent: String },
     EnterSkitchingBehaviour,
     SkitchingBehaviour,
     SkitchShimmyingBehaviour,
@@ -217,7 +217,10 @@ impl Operation {
                 attribute_x: encode(b"tweak_x"),
                 attribute_y: encode(b"tweak_y"),
             }, "FootPlantAbsorb" => Self::FootPlantAbsorb,
-            "FingerFlipOut" => Self::FingerFlipOut,
+            "FingerFlipOut" => Self::FingerFlipOut {
+                //Factory82BC7C18 binds authored grabintent and literal Grabbing.
+                grab_intent: required_text(a, "grabintent"),
+            },
             "EnterSkitchingBehaviour" => Self::EnterSkitchingBehaviour,
             "SkitchingBehaviour" => Self::SkitchingBehaviour,
             "SkitchShimmyingBehaviour" => Self::SkitchShimmyingBehaviour,
diff --git a/crates/skate-game/src/graph_host/tests/motion_board_adjust.rs b/crates/skate-game/src/graph_host/tests/motion_board_adjust.rs
new file mode 100644
index 00000000..5f6cca59
--- /dev/null
+++ b/crates/skate-game/src/graph_host/tests/motion_board_adjust.rs
@@ -0,0 +1,71 @@
+use super::*;
+
+#[test]
+#[ignore = "requires private stock graphs and animation banks"]
+fn board_adjust_stock_release_keeps_the_authored_air_blend() {
+    use crate::graph_runtime::CompiledGraph;
+    use skate_data::state_graph::{StateGraph, binding::Binding};
+    use skate_core::animation::playback_tree::{Evaluation, PoseCommand};
+    let root = std::path::PathBuf::from(std::env::var_os("SKATE3_ASSET_ROOT").unwrap());
+    let source = StateGraph::load(&root.join("private/stock/data/state/MotionGraph_OnBoard.stategraph")).unwrap();
+    let binding = Binding::from_graph(&source).unwrap();
+    let runtime = CompiledGraph::from_binding(&binding).unwrap();
+    let graph = LoadedGraph { source, binding, runtime };
+    let mut host = MotionHost::from_graph(&graph, &Collections::load(&root).unwrap(),
+        skate_data::animation_banks::AnimationBanks::load(&root).unwrap().metadata().unwrap(),
+        PlaybackContext { is_switch: Some(false), is_mirrored: Some(false),
+            board_available: Some(true), pro_skater: encode(b""), transition_override: None }).unwrap();
+    host.animation.skater_animation_flags = Some(0);
+    let find = |predicate: &dyn Fn(&MotionOperation) -> bool| {
+        host.remap.behaviors.iter().position(|&op| predicate(&host.operations[op])).unwrap()
+    };
+    let adjust = find(&|op| matches!(op, MotionOperation::Play(p) if p.animation == "BLEND_ADJUST_RIGHT"));
+    let air = find(&|op| matches!(op, MotionOperation::Play(p) if p.animation == "B_AIR_CYC" && p.transition.kind == 2 && p.transition.under == 1));
+    let filters = ["RightBoardAdjustMag", "RightBoardAdjustAngle"].map(|name|
+        find(&|op| matches!(op, MotionOperation::IntentFilter(p) if p.intent == name && p.settings.blend_out == Some(0.08))));
+    let frame = Frame { dt: 1.0 / 60.0, current: None, last: None, state_times: vec![] };
+    for id in filters { host.allocate(id, &frame); host.execute(id, &frame, 0).unwrap(); }
+    host.allocate(adjust, &frame);
+    host.execute(adjust, &frame, 0).unwrap();
+    for _ in 0..60 {
+        host.animation.advance(frame.dt, 0.0);
+        host.animation.motion_intents.insert("RightBoardAdjustMag", 0.9);
+        host.animation.motion_intents.insert("RightBoardAdjustAngle", 0.6);
+        for id in filters { host.execute(id, &frame, 1).unwrap(); }
+        host.execute(adjust, &frame, 1).unwrap();
+        host.animation.apply_parameters().unwrap();
+    }
+    host.animation.motion_intents.remove("RightBoardAdjustMag");
+    host.animation.motion_intents.remove("RightBoardAdjustAngle");
+    let mut reached_exit = false;
+    for _ in 0..120 {
+        host.animation.advance(frame.dt, 0.0);
+        for id in filters { host.execute(id, &frame, 1).unwrap(); }
+        host.execute(adjust, &frame, 1).unwrap();
+        host.animation.apply_parameters().unwrap();
+        if ["BoardAdjustMag", "BoardAdjustAngle"].iter().all(|name|
+            host.animation.filtered_intents.get(name).unwrap().abs() < 0.4) {
+            reached_exit = true;
+            break;
+        }
+    }
+    assert!(reached_exit);
+    host.animation.refresh_tree_attributes().unwrap();
+    host.execute(adjust, &frame, 2).unwrap();
+    for id in filters { host.execute(id, &frame, 2).unwrap(); }
+    host.allocate(air, &frame);
+    host.execute(air, &frame, 0).unwrap();
+    host.animation.apply_parameters().unwrap();
+    let evaluation = Evaluation { cull_threshold: 0.0, update_history: false };
+    let commands = host.animation.evaluate_pose(evaluation).unwrap();
+    assert!(matches!(commands.last(), Some(PoseCommand::Blend { weight }) if *weight == 0.0), "new air tree must not replace the outgoing pose: {commands:?}");
+    let mut previous = 0.0;
+    for _ in 0..12 {
+        host.animation.advance(frame.dt, 0.0);
+        let commands = host.animation.evaluate_pose(evaluation).unwrap();
+        let Some(PoseCommand::Blend { weight }) = commands.last() else { panic!("missing authored 0.2s blend") };
+        assert!(*weight >= previous && *weight <= 1.0);
+        previous = *weight;
+    }
+    assert!(previous > 0.999);
+}
diff --git a/crates/skate-game/src/graph_host/tests/motion_finger_flip.rs b/crates/skate-game/src/graph_host/tests/motion_finger_flip.rs
new file mode 100644
index 00000000..89e3dee8
--- /dev/null
+++ b/crates/skate-game/src/graph_host/tests/motion_finger_flip.rs
@@ -0,0 +1,65 @@
+use super::*;
+
+#[test]
+#[ignore = "requires private stock graphs and animation banks"]
+fn stock_finger_flip_crash_node_3080_lifecycle_and_intent_source() {
+    use crate::graph_runtime::CompiledGraph;
+    use skate_data::state_graph::{StateGraph, binding::Binding};
+    use super::super::motion_stock_gameplay::Operation;
+    let root = std::path::PathBuf::from(std::env::var_os("SKATE3_ASSET_ROOT").unwrap());
+    let source = StateGraph::load(&root.join(
+        "private/stock/data/state/MotionGraph_OnBoard.stategraph",
+    )).unwrap();
+    let binding = Binding::from_graph(&source).unwrap();
+    let runtime = CompiledGraph::from_binding(&binding).unwrap();
+    let graph = LoadedGraph { source, binding, runtime };
+    let mut host = MotionHost::from_graph(
+        &graph, &Collections::load(&root).unwrap(),
+        skate_data::animation_banks::AnimationBanks::load(&root).unwrap().metadata().unwrap(),
+        PlaybackContext { is_switch: Some(false), is_mirrored: Some(false),
+            board_available: Some(true), pro_skater: encode(b""), transition_override: None },
+    ).unwrap();
+    let behavior = 3080;
+    let MotionOperation::StockGameplay(Operation::FingerFlipOut { grab_intent }) =
+        &host.operations[host.remap.behaviors[behavior]] else {
+            panic!("The reported stock behavior must bind FingerFlipOut");
+        };
+    let intent = grab_intent.clone();
+    assert!(!intent.is_empty() && !intent.contains('$'), "authored intent must be resolved");
+    let frame = Frame { dt: 0.125, current: None, last: None, state_times: vec![] };
+    host.allocate(behavior, &frame);
+    host.execute(behavior, &frame, 0).unwrap();
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), None);
+
+    // Raw AG input cannot substitute for the MG intent read by virtual16.
+    host.action_intents.insert(&intent, 1.0);
+    host.execute(behavior, &frame, 1).unwrap();
+    let released = host.animation.pending_parameter(encode(b"Grabbing")).unwrap();
+    assert!((0.0..1.0).contains(&released));
+    // Native membership test treats zero as present and reverses the timer.
+    host.animation.motion_intents.insert(&intent, 0.0);
+    host.execute(behavior, &frame, 1).unwrap();
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), Some(1.0));
+    host.animation.motion_intents.remove(&intent);
+    for _ in 0..6 { host.execute(behavior, &frame, 1).unwrap(); }
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), Some(0.0));
+    host.execute(behavior, &frame, 2).unwrap();
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), Some(0.0));
+    // Reentry resets private time, but Begin/End do not publish a parameter.
+    host.execute(behavior, &frame, 0).unwrap();
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), Some(0.0));
+    host.execute(behavior, &frame, 1).unwrap();
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), Some(released));
+
+    let second = host.remap.behaviors.iter().enumerate().find_map(|(id, &op)| {
+        (id != behavior && matches!(host.operations[op],
+            MotionOperation::StockGameplay(Operation::FingerFlipOut { .. }))).then_some(id)
+    }).expect("stock graph has separate finger-flip exit nodes");
+    host.allocate(second, &frame);
+    host.execute(second, &frame, 0).unwrap();
+    host.execute(second, &frame, 1).unwrap();
+    assert_eq!(host.animation.pending_parameter(encode(b"Grabbing")), Some(released));
+    host.execute(behavior, &frame, 1).unwrap();
+    assert!(host.animation.pending_parameter(encode(b"Grabbing")).unwrap() < released);
+    assert!(host.animation.motion_attributes.is_empty(), "writes a tree parameter, not a physics packet");
+}
diff --git a/crates/skate-game/src/tests/action_host.rs b/crates/skate-game/src/tests/action_host.rs
index ae67b769..0afd18d9 100644
--- a/crates/skate-game/src/tests/action_host.rs
+++ b/crates/skate-game/src/tests/action_host.rs
@@ -52,6 +52,77 @@ fn gesture_behavior_publishes_and_releases_the_stock_tre_flip_intent() {
     assert!(host.errors.is_empty(), "{:?}", host.errors);
 }
 
+#[test]
+fn board_adjust_native_wrap_lifecycle_and_release() {
+    let mut config = parameter("", 0.0);
+    config.mg_intent = None;
+    config.mg_intent_mag = Some("RightBoardAdjustMag".into());
+    config.mg_intent_angle = Some("RightBoardAdjustAngle".into());
+    config.negate_on_mirror = true;
+    let mut host = ActionHost::new(ActionInstances::new(vec![ActionInstance {
+        operation: ActionOperation::BoardAdjust, config, parameters: vec![],
+    }]), OperationRemap { behaviors: vec![0, 0], conditions: vec![], hooks: vec![] });
+    let frame = Frame { dt: 1.0 / 60.0, current: None, last: None, state_times: vec![] };
+    let pi = f32::from_bits(0x40490fdb);
+    for mirrored in [false, true] {
+        host.stance = Some((false, mirrored));
+        Host::begin(&mut host, 0, [0; 6], &frame);
+        assert!(!host.motion_intents.contains_key("RightBoardAdjustAngle"));
+        host.action_intents.insert("BoardAdjustMag", 0.9);
+        // Expected outputs from82BA2D70..2E80: latch at seam, hold,
+        // unlatch crossing back; then exercise the opposite seam direction.
+        for (raw, expected) in [(3.0, 3.0), (-3.0, pi), (-2.0, pi),
+            (2.0, 2.0), (0.0, 0.0), (-3.0, -3.0), (3.0, -pi),
+            (2.0, -pi), (-2.0, -2.0)] {
+            host.action_intents.insert("BoardAdjustAngle", raw);
+            Host::update(&mut host, 0, [0; 6], &frame);
+            assert_eq!(host.motion_intents.get("RightBoardAdjustAngle"),
+                Some(&(if mirrored { -expected } else { expected })));
+        }
+        // Another instance has its own seam state, even for the same config.
+        Host::begin(&mut host, 1, [0; 6], &frame);
+        host.action_intents.insert("BoardAdjustAngle", 3.0);
+        Host::update(&mut host, 1, [0; 6], &frame);
+        assert_eq!(host.motion_intents.get("RightBoardAdjustAngle"), Some(&(if mirrored { -3.0 } else { 3.0 })));
+        // One missing member removes the PAIR and resets the latch.
+        host.action_intents.remove("BoardAdjustMag");
+        Host::update(&mut host, 0, [0; 6], &frame);
+        assert!(!host.motion_intents.contains_key("RightBoardAdjustMag"));
+        assert!(!host.motion_intents.contains_key("RightBoardAdjustAngle"));
+        host.action_intents.insert("BoardAdjustMag", 0.0); // present zero is valid
+        Host::update(&mut host, 0, [0; 6], &frame);
+        assert_eq!(host.motion_intents.get("RightBoardAdjustAngle"), Some(&(if mirrored { -3.0 } else { 3.0 })));
+        host.motion_intents.insert("Unrelated", 0.75);
+        Host::end(&mut host, 0, [0; 6], &frame);
+        assert!(!host.motion_intents.contains_key("RightBoardAdjustMag"));
+        assert!(!host.motion_intents.contains_key("RightBoardAdjustAngle"));
+        assert_eq!(host.motion_intents.get("Unrelated"), Some(&0.75));
+    }
+}
+
+#[test]
+#[ignore = "requires private stock graph"]
+fn board_adjust_stock_constructor_defaults_and_overrides() {
+    use crate::graph_runtime::{CompiledGraph, LoadedGraph};
+    use skate_data::state_graph::{StateGraph, binding::Binding};
+    let root = std::path::PathBuf::from(std::env::var_os("SKATE3_ASSET_ROOT").unwrap());
+    let source = StateGraph::load(&root.join("private/stock/data/state/ActionGraph_OnBoard.stategraph")).unwrap();
+    let binding = Binding::from_graph(&source).unwrap();
+    let runtime = CompiledGraph::from_binding(&binding).unwrap();
+    let graph = LoadedGraph { source, binding, runtime };
+    let host = ActionHost::from_graph(&graph, &skate_data::collections::Collections::load(&root).unwrap()).unwrap();
+    let nodes: Vec<_> = host.instances.operations.iter().filter(|op| matches!(op.operation, ActionOperation::BoardAdjust)).collect();
+    assert!(!nodes.is_empty());
+    for direction in ["Left", "Right", "Up", "Down"] {
+        assert!(nodes.iter().any(|op| op.config.mg_intent_mag.as_deref() == Some(format!("{direction}BoardAdjustMag").as_str())));
+    }
+    assert!(nodes.iter().any(|op| op.config.negate_on_mirror));
+    assert!(nodes.iter().any(|op| !op.config.negate_on_mirror));
+    // Right.Regular omits negateOnMirror; Right.Switch explicitly disables it.
+    assert!(nodes.iter().any(|op| op.config.angle_filter == 6 && op.config.mg_intent_mag.as_deref() == Some("RightBoardAdjustMag") && op.config.negate_on_mirror));
+    assert!(nodes.iter().any(|op| op.config.angle_filter == 6 && op.config.mg_intent_mag.as_deref() == Some("LeftBoardAdjustMag") && !op.config.negate_on_mirror));
+}
+
 #[test]
 fn const_callbacks_publish_then_remove_motion_intent() {
     let instance = ActionInstance {
diff --git a/docs/board-adjust-native.md b/docs/board-adjust-native.md
new file mode 100644
index 00000000..39df21f6
--- /dev/null
+++ b/docs/board-adjust-native.md
@@ -0,0 +1,66 @@
+# BoardAdjust native lifecycle and release
+
+The cleanup-only change `fd280fd` was reverted in `411260a` after a user
+reported a snap during return to neutral. This replacement ports the complete
+BoardAdjust lifecycle, rather than changing animation timing to hide the snap.
+
+## Reference and observed behavior
+
+Read-only sources under `Documents/Skate3Research/research/reverse-engineering`:
+
+- `generated/skate3_animation_research_recomp.71.cpp`, SHA-256
+  `a4b47427402cfc4fc6aa0a6e5b08d4fe81b974da669c107e610a960ec2652257`.
+- `XexDump/default_82000000_011B0000.bin`, SHA-256
+  `f4aa113eb541bfba03dbc108cf5ab43f58c965b20fa3b82f9c40938a0ad841c4`.
+- The same guest instructions decoded with IDA 9.3 in a disposable database.
+- Stock ActionGraph BoardAdjust includes, `MotionGraphIncludes/air.xml`, and
+  `MotionGraphIncludes/BoardAdjusts/T_BoardAdjust.xml` from `MiscloadState`.
+
+Addresses below are TU3 guest virtual addresses (image base `0x82000000`), not
+addresses in the Windows reference executable. The reference installation was
+located at `C:/CLEAN/Skate3CustomEngineLayer-0.1.0-preview.18-Windows`;
+its `skate3.exe` SHA-256 is
+`4d5234b2297fa7f1e02808ce2780ad37c960e4da6d26ae5004591cba91fe6904`.
+It was not launched or modified; no runtime parity claim is made for that build.
+
+Observed in recompilation and corroborated by IDA:
+
+| Callback | Guest address | Behavior |
+|---|---|---|
+| Constructor | `82BA2A30` | Magnitude name at object+28, angle name at +52, angle filter at +76, mirror-negation default **true** at +80. |
+| Allocate | `82BA2F48` | Separate 16-byte instance for each behavior. |
+| Begin | `82BA2BA8` | Clear instance wrap mode at +8 and previous raw angle at +12. No intent publication. |
+| Update | `82BA2BC8` | Require both source intents; copy magnitude, filter angle, optionally negate for mirrored stance, apply persistent angle seam logic. |
+| Missing input | `82BA2E88` | If either source is missing, remove both outputs and clear both instance fields. Present zero remains a valid value. |
+| End | `82BA2EB8` | Remove both authored outputs; no instance reset here. |
+
+The seam logic at `82BA2D70` detects a sign change when the previous raw angle
+has absolute value greater than pi/2 (`822538BC`, bits `3FC90FDB`). In mode 0,
+crossing from negative enters mode 1, crossing from positive enters mode 2.
+Mode 1 holds -pi (`822F8908`, bits `C0490FDB`), mode 2 holds +pi
+(`82060C44`, bits `40490FDB`). Crossing back from the opposite side clears
+the mode. Every successful update stores the **raw filtered angle**, even while
+the published angle is held at pi. This state was missing from the Rust host.
+
+## Release and animation handoff
+
+The stock graph filters missing axes toward zero with blendOut 0.08,
+clampAcc 0.03, clampVel 0.2. Recompilation `82BB17D0` agrees with the existing
+filter arithmetic, including the missing-input branch. The board-adjust state
+exits when the directional intent is absent and both absolute filtered values
+are below 0.4. The default airborne tree is `B_AIR_CYC` with authored time 0.2
+and transitionUnder enabled. Blend evaluation/weight functions `82B961F8` and
+`82B963D8` agree with the existing blend progression. No duration, threshold,
+filter coefficient, pose offset, or extra smoothing has been fitted or changed.
+
+The new tests cover the native seam branches, mirror signs, separate instances,
+entry/update/exit, partial input loss, present zero, stock constructor defaults,
+and the stock filtered release followed by its 0.2-second animation-tree blend.
+These are source-level tests, not a replay of the user's controller sequence.
+The reported visual snap's precise cause remains unconfirmed until gameplay
+validation; the additional native discrepancies are independently established.
+
+Validation (Windows MSVC release/static CRT): seven action-host tests passed,
+including stock graph parsing; the stock release-to-air animation test passed.
+That test observes a zero-weight incoming tree at handoff and the authored blend
+progression to full weight. It does not measure rendered bone-pose continuity.
diff --git a/docs/crash-reports.md b/docs/crash-reports.md
index ddbb544a..a9c22bb8 100644
--- a/docs/crash-reports.md
+++ b/docs/crash-reports.md
@@ -12,6 +12,123 @@ Coverage limits: a Windows unhandled-exception filter attempts a fixed, allocati
 
 For manual UI validation, run the executable with `--crash-report-preview`. This generates a clearly synthetic report and opens the popup without initializing the game, setup, Steam or assets. Check Copy report, clipboard text, Open folder, saved UTF-8 text and Close. Static tests do not validate desktop presentation.
 
+## Mixed-worktree dependency in f96be1d (2026-09-09)
+
+The DownTown report at tick1020 repeats the nonfinite walking result before
+the swept-line rejection. The full local stderr retains the finite GroundJob
+and tiny surface components omitted from the bounded report.
+
+The matching shipped PDB establishes that `movement_velocity/math.rs` was
+compiled from worktree `8186`, with SHA-256
+`4652072df4a51a6bf8eb2dd837e61d4fb6e01710d984334af8073deb4c4449ac`.
+That source lacks the earlier subnormal refinement fix. The intended source
+in this worktree has SHA-256
+`76de0780adb5ea015c57fa4118105669f1897ef01eafb611eed14cc829c5eda1`.
+The game build ID identified the game crate, but did not establish the identity
+of reused path dependencies. Matching EXE/PDB GUIDs alone did not catch this.
+
+`tools/build_verified_windows.ps1` now builds into a private
+`target/verified-windows` under the current worktree. Its verification step
+reads PDB source checksums and requires both current-worktree paths and matching
+SHA-256 for referenced project crates and vendored Bevy sources. It fails closed
+when required game/core/data source records are missing. The old shipped PDB
+fails this check (619 mismatched path/checksum entries).
+
+Use this build script for subsequent crash-test builds and retain its
+`source-checks.json` with the staged EXE/PDB and existing import/hash manifest.
+Do not share Cargo artifact directories between independently edited worktrees.
+This repair changes build provenance, not gameplay rules or collision validation.
+
+## Walking velocity convergence (2026-09-09)
+
+Observed user failure: clean revision `dff672a`, build timestamp
+`1788969088174193000`, report timestamp `1788969335`. At tick4059 in
+BipedGround on University, `OFFBOARD_GROUND_RESULT_NONFINITE` precedes
+`Invalid offboard swept-line request`. The job has finite spatial inputs;
+the controller publishes NaN velocity/position, a NaN right delta and a
+forward delta of approximately `-3.11e-43`. The collision query then rejects
+NaN XYZ coordinates. Its validation is correct and remains intact.
+
+The walking velocity limiter's portable reciprocal-square-root refinement
+formed `r*r` from a positive subnormal squared length. A finite correction
+of `1e-21` produces squared bits `0x000002CA` and a finite inverse root near
+`9.997e20`, whose square overflows to infinity. The two refinements then
+produce NaN. A focused pre-fix regression reproduced an all-NaN limited
+velocity from otherwise finite vectors. This establishes the numerical
+failure independently of the collision system; it is not a replay of all
+4059 input ticks.
+
+The fix normalizes only positive subnormal squared lengths by the exact
+power of two `2^24`, retains both refinement stages, and rescales the inverse
+root by `2^12`. It preserves the ordinary-input path, movement limits and
+invalid-input propagation. No global floating-point mode changes, collision
+bypass, arbitrary epsilon, or replacement player state are involved. This
+is a stability correction for the existing portable PC arithmetic, not a
+claim of bit-exact Xenon instruction emulation.
+
+Regressions cover the failing finite vectors, powers-of-two across the
+subnormal/normal boundary, limiting tiny corrections, steady walking updates,
+and the complete ground-controller publication (including position, lean and
+cadence). Zero and NaN checks ensure invalid inputs are not silently repaired.
+The report, matching stderr and arithmetic evidence are retained privately
+with the test builds. Gameplay validation remains with the user.
+
+Validation: the finite-delta regression failed before the arithmetic change
+with `[NaN, NaN, NaN, NaN]`. Afterward all 11 movement-velocity tests passed,
+followed by all 202 offboard library tests in the release MSVC configuration
+(`cargo test --release --locked --target x86_64-pc-windows-msvc -p skate-core
+--lib player::offboard::`). No game or renderer was launched.
+
+## FingerFlipOut (2026-09-09)
+
+Observed user failure: clean revision `1a6e95b`, build timestamp
+`1788967727931108700`, report timestamp `1788968141`, University fingerprint
+`c911af6099e02b65`. At tick3467 in KnownAir, MotionGraph behavior3080 returned
+`MotionGraph stock gameplay producer FingerFlipOut is not implemented`.
+This was an explicit unsupported-operation exit, with no recorded panic or
+native exception. The matching launch stderr contains the same error.
+
+Native recovery from the TU3 image mapped at `0x82000000`:
+
+- Factory82BC7C18 binds authored `grabintent` and literal `Grabbing`.
+  Vtable8232072C allocates a private float through82BBCB50, calls
+  Begin82BB3198, Update82BB7C40 and empty End82B61BB8.
+- Begin sets the float to zero. Update reads the MotionGraph intent map
+  through Actor20/virtual16. Membership lookup82454FD8 counts a zero-valued
+  intent as present. Presence subtracts the time-service delta; absence adds
+  it. This does not read raw ActionGraph or filtered tweak input.
+- Update clamps the retained time to layout190/198, evaluates eight curve
+  keys at1A0 and values at1C0 through PointGraph82481E10, then writes
+  `Grabbing` through ISkaterAnim80 (unnormalized, sequence -1).
+- Global constructor8289FD10..30 selects collection `41DB0C4F82003A15` at
+  offset164. Helper8289D4E8 identifies class `anim_motion`. The retail schema
+  independently maps layout190 to field `E0C1407B688858AD`, type
+  `Sk8::PointNegGraphData8`. Its stock timer bounds are 0 and 0.5 seconds,
+  with a descending grab blend from 1 to 0. Numeric names remain supported
+  directly; no shared asset edit or invented curve is required.
+
+The implementation retains one timer per bound behavior and publishes only
+on Update. Begin resets time; End leaves the last parameter alone. Other
+unimplemented operations still report errors.
+
+Evidence identities (SHA-256): TU3 mapped image
+`f4aa113eb541bfba03dbc108cf5ab43f58c965b20fa3b82f9c40938a0ad841c4`;
+tested stock MotionGraph
+`806b2665e435be4e313d70a06fab4538e0adf60a2dfd3e80e82ae8d0b4a2e7c1`.
+Bounded decoded instructions, schema lookup and the original report are
+retained privately with this test build. IDA changes were confined to a
+disposable database copy. The instruction/data mapping is observed;
+successful gameplay reproduction after the fix remains user validation.
+
+Focused regressions cover release/regrab timing, clamping, entry reset,
+the actual stock behavior3080, zero-valued intent membership, raw-input
+separation, independent behavior instances and Begin/End publication rules.
+They do not launch the renderer or replay the user's full input sequence.
+
+Validation: `cargo test --release --locked --target x86_64-pc-windows-msvc
+-p skate-game --bin skate3rust --no-default-features finger_flip --
+--include-ignored` passed both tests against the prepared assets (0.18 seconds).
+
 ## SetDeckPitchAndYaw (2026-09-08)
 
 The supplied report stopped in KnownAir at tick4813, MotionGraph behavior3373:
diff --git a/tools/build_verified_windows.ps1 b/tools/build_verified_windows.ps1
new file mode 100644
index 00000000..4ac15539
--- /dev/null
+++ b/tools/build_verified_windows.ps1
@@ -0,0 +1,19 @@
+param([Parameter(Mandatory=$true)][string]$OutputDirectory)
+$ErrorActionPreference = 'Stop'
+$sourceRoot = Split-Path -Parent $PSScriptRoot
+$outputPath = [IO.Path]::GetFullPath($OutputDirectory)
+if (Test-Path -LiteralPath $outputPath) { throw "Build output already exists: $outputPath" }
+New-Item -ItemType Directory -Path $outputPath | Out-Null
+# Never share path-dependency artifacts between concurrently edited worktrees.
+$targetPath = Join-Path $sourceRoot 'target/verified-windows'
+$previousFlags = $env:CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUSTFLAGS
+Push-Location $sourceRoot
+try {
+    $env:CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUSTFLAGS = '-C target-feature=+crt-static'
+    cargo rustc --release --locked --target x86_64-pc-windows-msvc --target-dir $targetPath -p skate-game --bin skate3rust --no-default-features -- -C extra-filename= -o "$outputPath/skate3rust.exe" -C "link-arg=/PDB:$outputPath/skate3rust.pdb" *> "$outputPath/compile.log"
+    if ($LASTEXITCODE -ne 0) { Get-Content "$outputPath/compile.log" -Tail 40; throw 'Game build failed' }
+    & "$PSScriptRoot/verify_windows_build_sources.ps1" -Pdb "$outputPath/skate3rust.pdb" -SourceRoot $sourceRoot -ReportPath "$outputPath/source-checks.json"
+} finally {
+    $env:CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUSTFLAGS = $previousFlags
+    Pop-Location
+}
diff --git a/tools/verify_windows_build_sources.ps1 b/tools/verify_windows_build_sources.ps1
new file mode 100644
index 00000000..9907d992
--- /dev/null
+++ b/tools/verify_windows_build_sources.ps1
@@ -0,0 +1,40 @@
+param(
+    [Parameter(Mandatory=$true)][string]$Pdb,
+    [string]$SourceRoot = (Split-Path -Parent $PSScriptRoot),
+    [string]$ReportPath
+)
+$ErrorActionPreference = 'Stop'
+$sourcePrefix = [IO.Path]::GetFullPath($SourceRoot).TrimEnd('\', '/') + '\'
+$pdbutil = Join-Path $env:ProgramFiles 'LLVM/bin/llvm-pdbutil.exe'
+$dump = & $pdbutil dump --files $Pdb
+if ($LASTEXITCODE -ne 0) { throw 'PDB source inspection failed' }
+$checked = @{}
+$failures = [Collections.Generic.List[string]]::new()
+foreach ($line in $dump) {
+    if ($line -notmatch '^- \(SHA-256: ([0-9A-Fa-f]{64})\) (.+)$') { continue }
+    $compiledHash = $Matches[1]
+    $compiledPath = $Matches[2].Replace('/', '\')
+    if ($compiledPath -notmatch '\\((?:crates\\skate-[^\\]+|vendor\\bevy_[^\\]+)\\.+)$') { continue }
+    $relative = $Matches[1]
+    $key = "$compiledPath|$compiledHash"
+    if ($checked.ContainsKey($key)) { continue }
+    $expectedPath = Join-Path $sourcePrefix $relative
+    $sourceHash = if (Test-Path -LiteralPath $expectedPath -PathType Leaf) {
+        (Get-FileHash -LiteralPath $expectedPath -Algorithm SHA256).Hash
+    } else { $null }
+    $matchesRoot = $compiledPath.StartsWith($sourcePrefix, [StringComparison]::OrdinalIgnoreCase)
+    $matchesHash = $sourceHash -eq $compiledHash
+    $checked[$key] = [ordered]@{ file=$relative; compiledPath=$compiledPath; compiledSha256=$compiledHash; sourceSha256=$sourceHash; matchesRoot=$matchesRoot; matchesHash=$matchesHash }
+    if (-not $matchesRoot -or -not $matchesHash) { $failures.Add($relative) }
+}
+foreach ($crate in @('skate-core', 'skate-data', 'skate-game')) {
+    if (-not ($checked.Values | Where-Object { $_.file.StartsWith("crates\$crate\") })) {
+        $failures.Add("No source checksums found for $crate")
+    }
+}
+if ($ReportPath) {
+    [ordered]@{ pdb=[IO.Path]::GetFullPath($Pdb); sourceRoot=$sourcePrefix; passed=($failures.Count -eq 0); files=@($checked.Values | Sort-Object file,compiledPath) } |
+        ConvertTo-Json -Depth 5 | Set-Content -LiteralPath $ReportPath -Encoding utf8
+}
+if ($failures.Count) { throw "PDB source provenance failed for $($failures.Count) entries: $(($failures | Select-Object -First 8) -join ', ')" }
+Write-Output "Verified $($checked.Count) workspace source checksums and paths in $Pdb"