test(objectql): the multi-reference stub driver's find holds the caller's bound

Claude-Session: https://claude.ai/code/session_01ADzJtzYTLUfgrRZHxkagkX
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/objectql/src/engine-multi-reference-element-shape.test.ts

@@ -85,7 +85,8 @@ function makeStubDriver() {
     async connect() {}, async disconnect() {}, async checkHealth() { return true; },
     async execute() { return null; },
     async find(object: string, ast: any) {
-      return Array.from(storeFor(object).values()).filter((r) => matches(r, ast?.where));
+      const rows = Array.from(storeFor(object).values()).filter((r) => matches(r, ast?.where));
+      return typeof ast?.limit === 'number' ? rows.slice(0, ast.limit) : rows;
     },
     async findOne(object: string, ast: any) {
       for (const r of storeFor(object).values()) if (matches(r, ast?.where)) return r;