Status: IN
The architecture's core invariants exhibit two orthogonal robustness properties: quality guarantees are scale-and-layer-independent (holding regardless of module count, implementation complexity, or abstraction layer), and state irreversibility is redundantly prevented (operational guards, structural monotonicity, and forward-only state machines enforce it at different architectural levels) — neither property depends on the other, creating a robustness product.
two unused depth-9 beliefs representing independent robustness dimensions; combining reveals the architecture's guarantees are robust in a product space (scale-independence × redundant enforcement)
Depends on (SL): quality-guarantees-are-scale-and-layer-independent, state-reversal-is-redundantly-prevented