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).

tools/image_generation_tool.py

@@ -575,7 +575,7 @@ def _build_fal_payload(
     payload: Dict[str, Any] = dict(meta.get("defaults", {}))
     payload["prompt"] = (prompt or "").strip()
 
-    if size_style in ("image_size_preset", "gpt_literal"):
+    if size_style in {"image_size_preset", "gpt_literal"}:
         payload["image_size"] = sizes[aspect]
     elif size_style == "aspect_ratio":
         payload["aspect_ratio"] = sizes[aspect]