Status: OUT
The architecture's cost shifting between write and read paths is both structurally safe and fully verifiable — the testing infrastructure covers the read path's growing responsibility as computation shifts toward it.
cost shifting is structurally safe (structural correctness holds) but the read path where costs accumulate has responsibilities exceeding test coverage — this gate captures the tension between structural soundness and verification completeness
Depends on (SL): structural-correctness-enables-safe-cost-shifting