Runtime runtime-v0.18.4

Mémoire Studio runtime sidecar binaries + resources tarball.

Consumed by github.com/sarveshsea/memi-studio at build time via scripts/fetch-runtime.mjs.

Pin in memi-studio's package.json:

"memoireRuntime": {
  "version": "0.18.4",
  "engineRepo": "sarveshsea/memi",
  "releaseTag": "runtime-v0.18.4"
}