Add parametric walls unit tests
50 Vitest-Tests für die parametrische Wand-Engine (src/model/parametricWalls.ts): GridRule, ModuleRule, ConditionalThicknessRule, ReferenceLineRule, SequenceRule, deduplicateWalls, matchesCondition/matchesTarget, Integration via resolveParametricWall. Vitest als devDependency + Testskript in package.json + vitest.config.ts ergänzt.
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