v0.4.1 – fixes: flow steps, duplicate relationships, actor lists

Bug fixes and small improvements found while maintaining a real use case model.

• vp_get_element now returns the steps of flows of events (they were always empty); sub-steps are returned as {text, steps}, and flows/steps can be looked up by id
• vp_set_use_case_details: replaceActors: true sets the exact, ordered primary/supporting actor lists (also clearing with an empty list); steps may contain sub-steps
• vp_add_connector / vp_build_diagram reuse an identical existing relationship (same type, ends and name) instead of creating a duplicate in the model; allowDuplicate: true forces a new one
• elements shown again via modelId report their real size immediately
• «include»/«extend» labels on short, steep lines are placed beside the line instead of on the arrow head

Install: close Visual Paradigm, replace the visual-paradigm-mcp-plugin folder in the plugins directory with the one from the zip, start VP. The skill (visual-paradigm-skill.zip) was updated as well.