test(objectql): the seed created_at pin's stub driver applies the caller's limit

check:objectql-double-limit flagged the new stub driver's find as
limit-blind; it now applies ast.limit after the filter, by presence.

Claude-Session: https://claude.ai/code/session_017ErfyP2Rx7XWHJA27QjyUi
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/objectql/src/plugin-audit-seed-created-at.test.ts

@@ -100,7 +100,9 @@ function makeStubDriver() {
     async connect() {}, async disconnect() {}, async checkHealth() { return true; },
     async syncSchema() {},
     async find(object: string, ast: any) {
-      return Array.from(storeFor(object).values()).filter((r) => matches(r, ast?.where)).map((r) => ({ ...r }));
+      const rows = Array.from(storeFor(object).values()).filter((r) => matches(r, ast?.where));
+      const page = typeof ast?.limit === 'number' ? rows.slice(0, ast.limit) : rows;
+      return page.map((r) => ({ ...r }));
     },
     async findOne(object: string, ast: any) {
       for (const r of storeFor(object).values()) if (matches(r, ast?.where)) return { ...r };