refactor(models): simplify recursive tree schemas

https://zod.dev/v4#recursive-objects

Author: matejchalk

packages/models/src/lib/tree.ts

@@ -12,15 +12,15 @@ const basicTreeNodeDataSchema = z.object({
     .describe('Additional values for node'),
 });
 
-export const basicTreeNodeSchema: z.ZodType<BasicTreeNode> =
-  basicTreeNodeDataSchema.extend({
-    children: z
-      .lazy(() => z.array(basicTreeNodeSchema).optional())
-      .describe('Direct descendants of this node (omit if leaf)'),
-  });
-export type BasicTreeNode = z.infer<typeof basicTreeNodeDataSchema> & {
-  children?: BasicTreeNode[];
-};
+export const basicTreeNodeSchema = basicTreeNodeDataSchema.extend({
+  get children() {
+    return z
+      .array(basicTreeNodeSchema)
+      .optional()
+      .describe('Direct descendants of this node (omit if leaf)');
+  },
+});
+export type BasicTreeNode = z.infer<typeof basicTreeNodeSchema>;
 
 export const coverageTreeMissingLOCSchema = filePositionSchema
   .extend({
@@ -48,15 +48,15 @@ const coverageTreeNodeDataSchema = z.object({
   ),
 });
 
-export const coverageTreeNodeSchema: z.ZodType<CoverageTreeNode> =
-  coverageTreeNodeDataSchema.extend({
-    children: z
-      .lazy(() => z.array(coverageTreeNodeSchema).optional())
-      .describe('Files and folders contained in this folder (omit if file)'),
-  });
-export type CoverageTreeNode = z.infer<typeof coverageTreeNodeDataSchema> & {
-  children?: CoverageTreeNode[];
-};
+export const coverageTreeNodeSchema = coverageTreeNodeDataSchema.extend({
+  get children() {
+    return z
+      .array(coverageTreeNodeSchema)
+      .optional()
+      .describe('Files and folders contained in this folder (omit if file)');
+  },
+});
+export type CoverageTreeNode = z.infer<typeof coverageTreeNodeSchema>;
 
 export const basicTreeSchema = z
   .object({