GET in 80 ms, decryption in 3893 ms, entries and trash counted, second call answers 304. try-open.js opens a container with Node so a failure can be attributed: a GCM tag that does not verify means wrong password OR altered file, and the app cannot tell which.
generateSecret takes a KeySpec; passing a JObject made the bridge emit a signature no method matches, and the call failed at runtime. Swallowed as 'unavailable', which hid my own mistake for a full test round - the failure now carries its exception message.
Measured on device: the Pascal PBKDF2 takes 6651 ms, unusable per unlock. AES-GCM through JNI works, plaintext and hash match the vector, so the container format is validated end to end.
r-zakarya