- scripts/anti_smuggle_check.py: detects vacuous theorem patterns:
* := rfl theorem bodies
* fun ... => rfl lambda bodies
* syntactically identical LHS/RHS in equalities
* quantified sums with bound variable renames
- Integrated as Layer 4 in existing anti-smuggle CI workflow
- Verified: catches the old vacuous YB tautology (fun ... => rfl pattern)
- Verified: zero false positives on current main
- --ci mode exits non-zero on any finding