The SDK's version.js reads package.json via readFileSync + __dirname.
When webpack bundles this, the CI build path (/home/runner/work/...)
gets baked into the bundle, causing ENOENT at runtime on user machines.

Stub replaces the runtime file read with a static version constant.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>