design for deletion Shipped
What this lens looks for
Build skills and rules that are easy to remove without affecting others; treat lines of instructions as lines spent — delete rules that no longer apply; do not abstract prematurely across skills; when in doubt, duplicate rather than couple two skills together
What its verifier checks
Each skill and rule can be deleted without breaking other skills; no cross-skill coupling via shared state; no premature abstraction layers across unrelated skills; dead rules (no longer triggered) removed rather than kept "just in case"