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).

environments/benchmarks/terminalbench_2/terminalbench2_env.py

@@ -162,7 +162,7 @@ def _normalize_tar_member_parts(member_name: str) -> list:
     ):
         raise ValueError(f"Unsafe archive member path: {member_name}")
 
-    parts = [part for part in posix_path.parts if part not in ("", ".")]
+    parts = [part for part in posix_path.parts if part not in {"", "."}]
     if not parts or any(part == ".." for part in parts):
         raise ValueError(f"Unsafe archive member path: {member_name}")
     return parts
@@ -561,7 +561,7 @@ class TerminalBench2EvalEnv(HermesAgentBaseEnv):
             # --- 5. Verify -- run test suite in the agent's sandbox ---
             # Skip verification if the agent produced no meaningful output
             only_system_and_user = all(
-                msg.get("role") in ("system", "user") for msg in result.messages
+                msg.get("role") in {"system", "user"} for msg in result.messages
             )
             if result.turns_used == 0 or only_system_and_user:
                 logger.warning(