Task 326: Stats Refresh

Status: DONE

Description

Update stats after Task 325 (symplectic + 3D + plasmoid cross-validation).

• Task count: 324 → 326
• Commit count: 463+ → 465+
• Cross-validation: 268 → 313 (scipy 168 + poliastro 25 + trim-thrust 5 + supplementary 115)