NPM Monorepo Fixture

This fixture represents a trimmed monorepo layout used by the analyzer microbench. It contains four packages under node_modules/ with realistic metadata and dependency edges.

@stella/core depends on lodash.
@stella/web depends on @stella/core and rxjs.
Third-party packages expose standard name, version, and license fields.

The files are intentionally small so that the bench harness focuses on directory traversal and metadata parsing overhead.