v0.20.3

Fixes

• The Docker image builds again. npm install in the build stage crashed with Cannot read properties of null (reading 'edgesOut') — an npm 10.9.2 arborist bug (that's the npm bundled with the node:22.17.0-slim base image) resolving the current dependency tree from scratch. The build now installs from the committed lockfile with npm ci after upgrading to npm 11, which is both reproducible and clears the bug. This also required un-ignoring package-lock.json (it was in .dockerignore) so the lockfile reaches the build context. Verified with a full docker buildx build. Not exclusive to this project's deps — any tree that trips the npm 10.9.2 bug hit the same wall.