chore: ruff auto-fix PLR6201 — tuple → set in membership tests (#23937)

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).

scripts/profile-tui.py

@@ -360,7 +360,7 @@ def format_diff(before: dict[str, float], after: dict[str, float]) -> str:
         b = before.get(k, 0.0)
         a = after.get(k, 0.0)
         d = a - b
-        pct_change = ((a / b) - 1) * 100 if b not in (0, 0.0) else float("inf") if a else 0
+        pct_change = ((a / b) - 1) * 100 if b not in {0, 0.0} else float("inf") if a else 0
 
         # Flag improvements vs regressions. For _p99 / _max / _total / gaps_over /
         # patches / writeBytes / backpressure, LOWER is better.  For fps / gaps_under,