Summary

• Adds gpec_stability_scan.ipynb: a self-contained notebook that runs ActorGPEC (n=1, no-wall) over a ±12 % major-radius scan for the D3D :default case using StudyDatabaseGenerator
• Runs serially (n_workers=0) with no Distributed dependency — no server setup required
• Plots δW(n=1) vs R0 with marginal-stability and nominal-R0 reference lines
• Follows the same structure as study_database_generator.ipynb

Test plan

• Open notebook in JupyterLab with a Julia kernel that has FUSE loaded
• Run all cells top to bottom — should produce 11 scan points and a smooth δW vs R0 plot
• Verify that a smooth curve (not noisy) is produced, confirming the IMAS read path works end-to-end

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