Penpot only exposes penpotMgmt to plugins running with global
scope. Without it, the MCP plugin failed on load when registering
its workspacechange listener.
When penpotMgmt is missing, the plugin now builds the workspace
metadata from the open file and skips the listener. execute_code
receives penpotMgmt as null and waits for layout updates as before.
The tool description and instructions tell agents that only the
open file is available when penpotMgmt is null.
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