Replace with for all literal-tuple membership tests. Set lookup is O(1) vs O(n) for tuple — consistent micro-optimization across the codebase. 608 instances fixed via `ruff --fix --unsafe-fixes`, 0 remaining. 133 files, +626/-626 (net zero).
Replace with for all literal-tuple membership tests. Set lookup is O(1) vs O(n) for tuple — consistent micro-optimization across the codebase. 608 instances fixed via `ruff --fix --unsafe-fixes`, 0 remaining. 133 files, +626/-626 (net zero).