This fixes a race condition in `napi_create_external_buffer` where the
finalizer was added separately via `vm.heap.addFinalizer`, allowing
native code to free/reuse the underlying memory while JavaScript still
held a reference to the ArrayBuffer, causing data corruption.
The fix ties the finalizer directly to the ArrayBuffer via
`createFromBytes`, matching the pattern used in
`napi_create_external_arraybuffer`.
Fixes#26446
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
a068119624