CreatorValet distributes a rebuild of mp3.wasm from wasm-media-encoders 0.7.0.
The wrapper enables LAME's standard Xing/Info frame and exposes
lame_get_lametag_frame so the application can write the final frame after
encoding. LAME's source is unmodified.
SHA-256: 4337f656e19fcabe192bdabdb7b923d9ba345d22d2a5ee413c99bd285fb0ad4f

Wrapper source and build scripts:
https://github.com/arseneyr/wasm-media-encoders/tree/0.7.0
Tag commit: 4a45333baadbab312d1cc0911151dfad23157c51

CreatorValet patch and reproducible build:
apps/web/src/wasm/lame-mp3-gapless.patch
scripts/build-gapless-mp3-wasm.sh
Emscripten SDK image:
emscripten/emsdk@sha256:30aa9fed39cc7810cc4338c77828bd513a6ee6b60c6b141bc6d9760aea5791e3

LAME 3.100 source used by that build:
https://github.com/arseneyr/lame/tree/98db548e8e851defbba3184125ce10725355c332
Commit: 98db548e8e851defbba3184125ce10725355c332

The WASM file is served separately from CreatorValet's application code at a
versioned URL. It can be replaced with a compatible rebuild without changing
the application bundle. The build script records the exact Emscripten link
command and emits the binary SHA-256.

LAME's source headers grant GNU Library General Public License version 2 or,
at the recipient's option, any later version. The complete version 2 license
text is provided as LICENSE beside mp3.wasm.