fix(core): align ngt-primitive handling with R3F reconciler behavior

- Always delete and regenerate __ngt__ instance state for primitives to
  simulate a fresh object (matches R3F's createInstance pattern)
- Fix isPrimitive check in removeThreeChild to correctly skip disposal
  for primitives (was using !== instead of ===)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: nartc

libs/core/src/lib/renderer/renderer.ts

@@ -212,12 +212,13 @@ export class NgtRenderer2 implements Renderer2 {
 		if (name === 'ngt-primitive') {
 			if (!injectedArgs[0]) throw new Error(`[NGT] ngt-primitive without args is invalid`);
 			const object = injectedArgs[0];
-			let instanceState = getInstanceState(object);
-			if (!instanceState || instanceState.type !== 'ngt-primitive') {
-				// if an object isn't already "prepared", we'll prepare it
-				prepare(object, 'ngt-primitive', instanceState);
+
+			if (getInstanceState(object)) {
+				delete object['__ngt__'];
 			}
 
+			prepare(object, 'ngt-primitive');
+
 			const primitiveRendererNode = createRendererNode('three', object, this.document);
 			if (injectedParent) {
 				primitiveRendererNode.__ngt_renderer__[NgtRendererClassId.parent] =

libs/core/src/lib/renderer/utils.ts

@@ -194,7 +194,7 @@ export function removeThreeChild(child: NgtInstanceNode, parent: NgtInstanceNode
 	}
 
 	// dispose
-	const isPrimitive = cIS?.type && cIS.type !== 'ngt-primitive';
+	const isPrimitive = cIS?.type && cIS.type === 'ngt-primitive';
 	if (!isPrimitive && child['dispose'] && !is.three<THREE.Scene>(child, 'isScene')) {
 		queueMicrotask(() => child['dispose']());
 	}