Move with collision reacts along the contact normal: it travels to the surface, stays flush and slides the rest of the move along it with Coulomb friction (the mean of both colliders, a tile counts as 0.5), a circle now rolls over an edge instead of catching on it, pushed dynamic bodies move off along the normal, Move gains the outputs hit, normal x and normal y, an object without its own collider moves freely, and editor run and play share the same path through Solids; contact point and normal come from our own f64 geometry (contactBetween), because Rapier's castShape lands 3e-6 px inside the wall in f32 (#150)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/core/graph/NodeContext.ts

@@ -97,6 +97,17 @@ export interface PhysicsControl {
   setGravity(x: number, y: number): void;
 }
 
+/**
+ * What a move with collision met: which of the object's own axes something stood against, whether
+ * it hit anything, and the world normal of the first contact (pointing away from what was hit).
+ */
+export interface MoveOutcome {
+  blockedX: boolean;
+  blockedY: boolean;
+  hit: boolean;
+  normal: { x: number; y: number };
+}
+
 /**
  * Everything the graph does to the world goes through here, so the core stays free of runtime
  * imports. Implemented by the runtime (BehaviorSystem) and by test doubles.
@@ -132,10 +143,10 @@ export interface NodeContext {
   /** A collider entity stands for itself; any other entity for its direct collider children. */
   isTouching(a: EntityHandle, b: EntityHandle): boolean;
   /**
-   * Moves `target` by (dx, dy) in local units, stopping solid colliders at other solid ones axis by
-   * axis (x first, then y) so it slides along walls.
+   * Moves `target` by (dx, dy) in local units; its solid colliders stop flush at other solid ones
+   * and the rest of the move goes on along the surface, less what friction takes.
    */
-  moveAndSlide(target: EntityHandle, dx: number, dy: number): { blockedX: boolean; blockedY: boolean };
+  moveAndSlide(target: EntityHandle, dx: number, dy: number): MoveOutcome;
   /** Absent where nothing is simulated: the editor run, and a test double that does not ask for it. */
   physics?: PhysicsControl;
   log(message: string): void;