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refactor(visualization): add readonly modifiers to never-reassigned members

Mark 9 class members as readonly per SonarCloud S2933. Update tests to
use .clear() instead of reassigning readonly Set instances.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
C
Christian Hühn committed
e226d0ec1fa5e925747008d579df94751fba2a95
Parent: e14ba84
Committed by Christian Hühn <161825497+ChristianHuehn@users.noreply.github.com> on 2/23/2026, 1:56:19 PM