- WorkflowNodeEditor overlay was missing the `open` class, so the
graph editor mounted with display:none — clicking the button just
dismissed the steps view. Add `open` so the overlay renders.
- Add fusion-plugin-compound-engineering and fusion-plugin-roadmap to
BUILTIN_PLUGINS so they show under Settings → Built-in Plugins.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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