js_run tool crashes when using fetch

[deepfates]

Description

The js_run tool crashes with a QuickJS memory error when attempting to use fetch().

Reproduction

bun run examples/js_agent.ts
› Can you fetch https://example.com

Error

Aborted(Assertion failed: list_empty(&rt->gc_obj_list), at: ../../vendor/quickjs-ng/quickjs.c,1954,JS_FreeRuntime)
QuickJSUseAfterFree: Lifetime not alive

Notes

• The js_run tool has allowFetch: true by default
• The js tool (persistent REPL) does not have this issue since it doesn't support fetch
• Likely an issue with @sebastianwessel/quickjs or how we're managing the sandbox lifecycle