Upstream licensing declaration — @webaudiomodules/sdk 0.0.12

The exact published package.json declares:
  "license": "MIT"
  "author": "WebAudioModules Working Group"

Primary sources:
https://registry.npmjs.org/@webaudiomodules/sdk/0.0.12
https://github.com/webaudiomodules/sdk/tree/d425ee7ec0479b2a2ee0940374242356997b8ba6

The npm archive and the matching upstream commit contain no top-level MIT
license text or copyright notice. No copyright holder has been inferred or
invented here. This file records upstream's declaration; it is not a substitute
copyright notice authored on upstream's behalf. Original source headers and
package metadata are preserved unchanged.

Exception: src/RingBuffer.js explicitly identifies its adapted code as MPL-2.0
and credits padenot. Its complete upstream RingBuffer_LICENSE.txt is included
alongside the unchanged RingBuffer.js source. Do not describe all SDK source
as exclusively MIT. The original source is included with this distribution.
