Status: IN
Engineering defects occupy a paradoxical equilibrium: they are permanently frozen (no mechanism can remediate them under the isolation architecture) and structurally harmless (inseparable from the quality inversion that makes algorithmic quality high), so defects function as permanent features of the architecture rather than obstacles to correctness.
permanence (frozen by isolation) + harmlessness (inseparable from quality inversion) = defects as equilibrium features
Depends on (SL): engineering-debt-permanently-frozen, quality-inversion-structurally-inseparable